There is a serious problem with this forum in the shape of abusive moderators who vandalize or delete contributions which do not match their ideological agenda.
How can this community abridge or (hopefully) terminate the influence of abusive moderators?
Alright, this is kinda a two pronged answer.
One - How do you deal with an (allegedy) abusive mod team? Easy. Follow the instructions in this Meta Stack Exchange post.
(Basically, use the contact us link to reach out to the SE Community Managers. They're employees of SE. They'll look into things and take whatever action is merited, if any.)
Two - Dealing with what happened with your answer.
The first thing you have to remember - SE is collaborative. Anyone can edit any post (and either it's live or it gets marked as a suggested edit, depending on rep level and/or if you're a mod or not). So moderators and/or other users might edit your posts to make them clearer, or take out bits that don't fit with the SE model or the site's scope.
If I had to guess, the edits were to take out some of the...less savoury and more accusatory language in your original post. You made a lot of unfounded judgements, calling the girlfriend "sadistic, narcissistic and emotionally unstable", labelling her as emotionally abusive, etc. A bunch of that violates the Be Nice policy, which I know you're aware of because I know you referred to it in one of the many comments that you left.
Also...we're not here to diagnose people. We're not here to be lawyers and give free legal advice, for a variety of really good reasons. One of the bigger ones being that, well, you cannot and will not ever ever ever get the full picture of a situation from a few paragraphs of one single question on an SE site. We don't want to set precedence for this sort of thing - it can have real life harmful repercussions if we open ourselves up to this sort of thing. (Regardless of what you think you might know about how things are legally defined anywhere in the world).
Catija was trying to leave the bulk of your answer intact, the bits that were actually helpful to the OP while removing the parts that were quite rude and/or tried to dispense legal advice.
HDE removed your answer when you reposted it, because, well, you were pretty much gaming the system at that point - you didn't like it was locked, so you posted it again. This isn't how it's supposed to work - if a post is locked, it's for a reason. It gives people time to deal with whatever controversy is going on like calm, rational adults, without the distraction of possible edit wars and other such things. Reposting your answer circumvented that whole system, because you didn't seem interested in any sort of constructive dialogue.
That's it, that's all that happened.
Instead of reacting calmly and rationally, and following the Be Nice rule, and trying to have open dialogue about what happened, you kinda jumped off the other end of things and started attacking people personally. That's not going to win you any sort of favours. There wasn't any sort of censorship, it wasn't a personal attack - the mod team was just doing what they do best - moderation.
Let's get a couple of things straight about what happened.
As of Revision 3 of your answer, you had called the OP's girlfriend "sadistic, narcissistic and emotionally unstable", and called her behavior "shitty and manipulative". You also referred to her as "abusive", and stated that she "sucks". These are all blatant violations of the Be Nice policy, which requires civility by all users.
Catija reasonably edited that out. You then responded by editing in a claim that the girlfriend's behavior "constitutes abuse" in England and Wales (although the OP is, in fact, in Germany). We don't dispense legal advice. Period. This was then edited out by Catija, and the post was locked, because you were clearly going to keep adding all of this in again, as evidenced by the fact that you reposted your answer. I deleted it because, again, the content has no place here.
It's not abusive to edit a post so that it follows the rules of the site. That's all that happened here. It's not harassment, or censorship, or anything else. We're just making sure that what you're writing fits in with the site's standards.
Let me add one last thing.
Sometimes, it might not be totally clear as to why a certain moderation action was taken. Maybe we didn't do a great job of explaining why we did what we did, or maybe you're just not totally sure about what the site's policies are. In that case . . . please ask us. We're always willing to talk. If you want an informal setting, we're often in The Awkward Silence the site's chat room.
I've tried really hard to be clear and transparent about moderation over the years, but I don't always succeed. Whatever happens, we're going to do our best to make stuff as understandable as possible. So when in doubt . . . just ask. We'll try to answer.
I'm not going to repeat information already stated in the other two highly upvoted answers (which I do agree with). They've already explained why the mods edited out the things you posted and why you were considered out of line.
However, I do want to emphasize that it's important to remember that IPS is a beta site, and that comes with a few really important (and sometimes stressful) things:
So what I'm trying to say is that the moderators really aren't your enemy. If you don't like the rules they moderate by, you should be frustrated with the people who are voting for them on meta. How do you fix that? You participate in meta discussions so that your voice is heard, and this site becomes something we all (mostly) enjoy.
Be a part of the community at a deeper level if you want to help influence what is acceptable and what is not. By absolutely no means at all are moderators wild cannons operating by their own rules. Everything they do is backed up by something that has been talked about and positively accepted by the meta community.
They are completely out of control. If you don't follow their template for an answer perfectly, you will be down voted into oblivion, locked closed, etc. Their template is ever changing and does not apply to all answers.
There is generally no rhyme or reason, they are especially harsh on new posters, but allow some leniency to users with a few thousand rep.
Sorry for your experience here. I've been trying to stay away myself because of this heavy handed approach to what I thought was a site where we were trying to help each other.
