I think a lot of guys think kissing, holding, and fondling are forms of comfort; the way they are made, sex can be "comforting" to them, make them feel better and not necessarily have any emotional baggage. Women are quite a bit more complicated. I think since you did not show any surprise or anger at his coming into the bathroom (I would have locked the door) and he did ask you were you all right (and you replied you would be) if you looked physically ill he may have only thought you were physically unwell, not known about the emotional difficulties you were struggling with.

I would just call it a very unpleasant experience you did not want to repeat and continue work on my past abuse history to see if I could learn to cope better when sexual experiences come up in the present to encourage or discourage them based on what you want in the present from that experience instead of past issues getting mixed up with them.