What’s wrong with me

Basically my boyfriend and I always snap each other selfies throughout the day and whenever he snaps me on like a Friday night and I see that he’s out I get really stressed out and overthink and make myself sad and I don’t understand why. I just hate knowing that he’s out with his friends drinking and probably looking at girls around him and omg it just stresses me but i really don’t have any reason to feel like this it’s so annoying