It really depends on the content of the question. A lot of dating questions are asking us to interpret someone else's behavior, which is something that can't easily be done and goes a bit against the topic of this site. That topic is Interpersonal Skills, which are the behaviors people use to interact well.
Dating or romantic relationships are not interpersonal skills, they are a context you use interpersonal skills in. As such, questions that are only about dating or romantic relationships and not related to interpersonal skills are off topic: Too often we get 'does she like me' questions that we simply can't answer and that aren't about interpersonal skills at all. Or questions that should go on Reddit's Am I The Asshole, which are asking us to tell us who's right or wrong.
We do encourage people to include context in their questions when we ask them to let us know who was involved. That's where the nuance is: questions about interpersonal skills in the context of dating/romantic relationships are fine. As long as you keep your question focused on the interpersonal skills part: the behavior you use to interact, it should be fine to ask something that also involves dating and romantic relationships.
If you're still unsure, take a look at the checklist for what makes a good subjective question, IPS's good question checklist or consider posting in the Sandbox first for some help refining your question.