Constantly jealous!

My SO and I are doing long distance but I'm constantly jealous of all his new friends - PARTICULARLY the young attractive ones 😓 he tells me about all the women that are coming up to talk to him and I just can't deal! I know it's probably mainly insecurity on my part but any tips on how I can deal with it better?

He was cheated on before, so I'm 99.9% certain he's not going to cheat. Since he knows what it feels like to be on the receiving end of that. But HELP! Im trying to keep my jealousy under wraps 😓