Me(17F) and my boyfriend(18) have been together on/off for 2 and a half years. Both times we've "broken-up" it's been because of a female friend of his convincing him to leave me. I know we weren't perfect but he never tried talking to me but whatever, we were both 16 so who cares right? He text me on my birthday asking to hang out and we got back together and that was about 10 months ago and we've been great since.

But now all of a sudden he's been sneaking off to see the friend that broke us up, and trying to play it off to me by just saying he's meeting "someone" but I know it's her. I'm not jealous, and I don't think he's cheating but when we got back together I stopped contact with one of my ex's (who was one of my closest friends for our whole relationship and was telling me the same things his friend told him) because I knew it bothered him and we had an agreement that we weren't going to let other people interfere with our relationship again. 

WIBTA if I went to see my ex again since he's sneaking off to see his friend without telling me? I'm not going to cheat or anything I just miss one of my closest friends. 