I'm having relationship problems
So, my girlfriend and I are having a rough time. I don't know if it was my fault. I'll admit, I've flirted with a girl once over facebook. She found out about it. do I regret it, Of course. I felt really bad. An I promised her that it'll never happen again. But after that, I haven't talked to any of my friend girls. But today, I came to see her. She had her friend with her, an me and her friend had a conversation. And my girlfriend, she thought me and her were flirting. I messed up really bad. What could I POSSIBLY do to fix this?