Jealousy

So I kinda need to rant/ need opinions on what I need to do or how I should get over this myself. I have been with my boyfriend for a year and a half, it's pretty much a really healthy relationship. We did break up once (he wasn't feeling the same) and we wanted to remain friends. When we met up to bury the past, we ended up talking about getting back together, mostly on his part because he felt as I would be "the one that got away"... and yes I wanted him back too. Well, we are past that... still going through couple's counseling and I've been constantly dealing with jealousy.Most of his friends are gay men, so I immediately get some sort of jealousy when he hangs out with new friends who I find to be more attractive than myself. I trust him, I know he loves me, and I know he would never cheat on me. We actually even spoke about what are the things we should/ should not do while we are together (ex. what constitutes as cheating, being touched by friends.. etc) Anyway, ever since we broke up and gotten back together, I constantly go through his Tumblr, and what I have found has really been getting me jealous. When we met back up we told each other EVERYTHING, and by everything I mean, who we had sex with during the breakup, if we got tested for HIV/STI's, who we sexted, all of it. In his list it was his friends, one who he actually hooked up with before I had met him - who I actually find really nice. Among the guys he sexted was one of his Tumblr friends (he lives overseas) who I do get jealous of. His tumblr friend is actually pretty respectful when he found out we got back together, but in some posts he makes about my bf or tags my bf in seem a little flirty... On my boyfriend's tumblr he also comment's on other guys pictures which suggest that can be counted as harmless flirting... I find myself getting angry... not at him, but at myself for feeling jealous. He does show me his tumblr sometimes when we are cuddling, and I kinda want to ask "Oh who's that" or something so he can say something... Like sometimes I wish I had an access of many attractive gay friends to talk to... Like I try to go through Twitter to see if I can somehow make friends... or maybe even open up an Instagram account. Who knows, I'm def not looking to cheat... and I def don't want to be petty... but I feel like I need to do something.