Should you tell a girl you like that you are jealous?

Not unless you're with the guy. If you're in a relationship with him I think it's fine if you tell him that you're jealous about the fact that he talks to other women etc. But if he's not yours never tell a guy you're jealous because he's going to think you're into him and would do much worse things to make you more jealous and that just ain't good. (=