OP here. While I definitely wouldn't have accepted, as it might make things weird for my student (who is only 11 btw for whoever thought I should ask her if her parents are together), he is definitely still married, as I asked him. According to him, they are separated, which I'm sure is not fun, but I live in a small town and I'm sure I would be fired were I to date a married person. I explained that to him and he suggested going on a date out of town to "protect" me and all the red flags went up. Next parent teacher conferences are probably going to be a little weird.