<human>: So my ex and I broke it off awhile ago and any post break up feelings have been dealt with, however the problem is that this particular ex also shares mutual friends with me. So whenever I go to a friends party I run into her and her new SO which normally would be no big deal, whats done is done. But they have made it there mission to befriend me and I don't understand why. She asked when we split if I wanted to still be friends and I politely said that it wasn't a good idea, yet now she and her SO guard the beer cooler and lie in wait for me. How do I get it across that I really don't want to be friends with her, without being a complete ass and losing all of my friends?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Ex wont won't take the hint to leave me alone, I can't have a good time with mutual friends because she and her SO seek me out at parties.