<human>: Condense the text into a few key points

Hello /r/relationships! I thought this might be a good place to ask. In the past,I had always been the "jealous type" - which basically means, I had always been insecure. I'm well aware of this fact. I got jealous for no reason what so ever. 

Now, at my age (30 female), I have realized that I am awesome, that I deserve to be with someone equally awesome, etc. But it doesn't stop me from sinking into those old habits of jealousy. I'm in a new relationship and I already see the writing on the wall. The new guy is "good" friends with ALL of his ex-girlfriends. His fiancee from 5 years ago? Yep, her too! The girl that broke up with him, that they lived together, that re-broke up with him just this past January - yep her too! **AWESOME** ... /sarcasm off

The thing is, he really likes me. He wants to spend a lot of time with me, texts me periodically throughout the day, etc. All great stuff. 

How can I stop being insanely jealous when she (most recent ex) texts him just saying hi or whatever, or comments all "cutesy" on his Facebook posts, or when he goes over to hang out with her sister that she is currently living with (she isn't usually THERE when he goes to visit, but she could be). It eats me up inside and I hate it.

I have been the "crazy jealous" girlfriend before "Don't talk to that girl, don't hang out with that person", etc. That is no way to act, and just destroys the relationship anyway. 

So how do I keep those feelings in check? How do I not instantly flare up inside when his phone chirps or he mentions her (or one of his other exes)?
<bot>: 30/F with 31/M that is still friends with all of his exes. I have a tendency to be insanely jealous. How do I keep those feelings in check and make this a successful relationship (on that end)