Should i be worried that my ex is fb friends with my boyfriend?

[Cherriesâ„¢]

so my stalker ex is friends with my guy, it all started when my ex an i were friends at first a few yrs back and i told him that i liked Renee (not bf at the time) thinking nothing of it cause we were friends never thought we'd end up together a few months later :\ anyways we broke up last May and he called me last week and asked me 'if the reason i broke up with him was to be with Renee?!?!' he said he remember i used to talk about him so he tracked him down on fb to ask him, and my bf told him yes we are together :| which lead my ex to tell me he's friends with Renee friends (obviously he being friends with the guys to stalk us because he's not the type of guy who hangs out with guys like my bf and his friends....what should i do it's uncomfortable ? btw the reason i broke up with him was because he was controlling..