Girlfriend lies......????

My girlfriend lied to me about going out on Saturday night??

My friend saw her sisters Insta story and it was my girlfriend walking around with her bra hanging out at the club.. and they blocked me from seeing it?? I don't get why??

I asked her about it and she acted dumb and after 4 times of asking why she lied and blocked me from seeing the story she said cause she didn't want me to think she was up to no good...

I'm so confused........ now she is begging and won't stop saying she loves me and trying to call me and that she didn't do anything and didn't hook up with anyone... won't stop begging.... when all I did was ask a question..