Girlfriend LAUGHS AT OTHER GUY'S JOKES even though she is not interested in them?

themanwithaplan6666
My girlfriend is the type who laughs A LOT, at many different things. She also laughs when she feels awkward. I make her laugh all the time.

We have ended up in several situations where a guy (some loser making popcorn at the theatre) tries charming her with jokes (while I'm there) and since she ends up laughing, that guy starts to look at me like "hey, your girl digs me man". There's this weird underlying competition, and these guys take her laughs as indicators of interest.

I know she's just laughing, but I've made her aware several times that her laughing at every stupid thing the guy says makes them think she's interested. She said she'd try to stop, but she hasn't! It annoys me, what to do?

Girlfriend LAUGHS AT OTHER GUY'S JOKES even though she is not interested in them?
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