When a girl laughs at your jokes?

alfwasagoodshow
Ok this girl laughs at my jokes all the time in class because they are funny. So today I purposely told bad jokes to see of she laughed and she indeed busted out laughing at one that no one else laughed at. I think this girl likes me but is shy, I'm not 100% sure. My question(s) are when a girl laughs at your bad jokes does she like you? Also, if I talk to her in class and we kind of flirt/tease (like I said its hard to tell) is weird to add her on Facebook? Finally, the reason I ask this is because I have a girlfriend who I love but I cannot stop thinking about this other girl and I don't want to make a bold move and risk losing my current girlfriend if I don't have a better indication that the other girl likes me. Any advice would help, thanks in advance Internet strangers!
When a girl laughs at your jokes?
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