Opinions, advice needed.?

So, I am not sure if this is legitimate speculation or just insecurity/paranoia. But,my girlfriend was at a gay friends birthday party last night. She texted me saying. "Lol I love Jason. He is on the other side of the room winking at me and making "humping" motions. I got semi-jealous I guess (which is rare) and told her. She texted me saying -kisses you- baby, remember you have me (: allllll to yourself and I'm in love with you". She told me to please shush and said I wasn't being stupid but protective of what's mine then she said I was hers and she was mine and that she wanted no one other than me.

I logged onto to Facebook today and saw where she left a status tagging everyone at the party. The Jason guy was tagged in a comment she left saying "and Jason I miss you already"

Should I talk to her about that. I don't think she would cheat on me, but could she possibly have feelings for this guy?

All answers greatly appreciated.