My boyfriend has a very weird way of expressing his affections to me. He expresses his affection by groping me, spanking my bums whenever nobody's looking, in public. He just needs a private moment to grope me. This doesn't come across to me as any sign of affection per se. I think this is plain and simple sexual. I've asked him why he has to grope me all the time because I am not a sexual object; he gets pissed off and tells me that he is just trying to be affectionate towards me. Can this be a form of affection?