I've been friends with this guy for about a year and during that time he's had an on-off girlfriend. Whenever they split up he would message me asking me to meet him and being generally attentive. I always brushed it off as I wasn't interested. Despite this we remained friends, as part of a bigger friendship group.
Over the summer I met someone and we are now dating. We went to an event together where the male friend was and when my female friend told him I was there with my boyfriend, he apparently got quite arsey and told her repeatedly that I didn't have a boyfriend. She'd suspected previously that he was interested in me but I didn't really see it until she told me this. When I bumped into him later that night (I was on my own at this point) where we would normally have a friendly hug and a kiss on the cheek, he ignored me when I said hello.
My female friend suggested that I should tell BF about this guy because she felt he would try and jeopardise things. She's good friends with his on-off girlfriend and knows him better than I do. She thinks he's a nasty piece of work. I decided there was nothing to say - I wasn't interested so I didn't think it was necessary.
FF a couple of months and it turns out they are both going to be at an event this weekend. There won't be many other people there that they know and I think there is a good chance they will end up spending time together. Male friend hasn't spoken to me since. Female friend's warning is making me feel paranoid. Do you think I should say something to BF?