Friends with ex-boyfriend.

[Borg69]

Insecurities, jealously, and potential red flags don't mix...

At this point, not much you can do other than to explain to your BF how you feel, try to curb your insecurities/jealousy, and wait for evidence that's a little more concrete.

The ex sounds like a tool... to be sure... but on the other hand - I've had friends I've known for years. Some of them go through a different BF every other month. Not to sound too cold, but I don't waste a lot of time trying to get to know them as I know they won't be around long. I could kinda see his side in that THEIR "relationship"/friendship, from his point of view doesn't really involve YOU. Depending on how he feels, maybe he doesn't want to see his ex with someone else doing the things they used to do.

I have an Ex I'm friends with and years ago, it was hard for me to spend time with him and his then current BF seeing my ex doing things for him he wouldn't for me, or seeing him doing things with the BF which irritated me when I was with him opening old wounds.

If you love him, the baggage is part of the package.