Last night I was a park with a friend, my current gf lives near this park. So my friend told me if I wanted to pass by her house and I accepted. We are on his truck, turn on the street where she lives and... there he is, her ex. She was in the car with him, we passed a couple times more and they went inside her house... I said, fine, she will tell me what happened, and when I got home she sent me a text, gf said she was at the doctor because she felt bad, I kind of asked about her ex and she said "he sent me a message"... what the actual f*ck! I saw them together! How should I proceed?

This girl has been the sweetest, most loving and caring gf I've had and...AWALT.