So I tried to make my crush jealous by flirting with this other guy and then he shows me a picture of him and his girlfriend (kinda bragging about it) should I just try to forget about him and back off?
In your case, it may be a case of "what goes around comes around. " You tried to make him jealous first. He may be trying to make you jealous in return. I would "test" him in a few more areas before you give up.
Actually, I agree with what Rafael said - find out if it's his current girlfriend. If he has a girlfriend, he may be bragging because he really likes her and is not interested in anyone else. - 6 months ago