Because your jealousy isn’t working for you and you know it.
1. Recognize when you are being a jealous weirdo.
A lot of the time when you feel jealous, you’ll start little arguments or say passive-aggressive things rather than talking about what’s actually bothering you. (For me, it’s responding to everything he says with, “Yeah, you would do that.” I don’t know why.) If you can acknowledge, “Oh, I’m really jealous right now because you were talking to a girl at the bar last night and it made me feel weird,” that’s an important first step.
2. Try to look at your relationship from the perspective of one of your friends.
If you were your friend and you heard about your situation, how would you react to it? Would you be freaked out by it, or would you think it sounded totally normal and probably fine? Putting some distance between you and your relationship always helps you to see it more clearly and will potentially stop you from having a panic attack inside an H&M for no reason.
3. Focus on how great your relationship actually is. So you saw what looked like your boyfriend flirting with one of his female friends. OK. But keep in mind, you guys have an entire history between you two and a pretty unmatched closeness. Everyone flirts, sometimes without even really being conscious of it. It doesn’t always mean they want to act on it. I think I flirted with the guy at my deli the other day and I could not tell you why. I think I was just tired and out of it. I really need to get more sleep, you guys.