My boyfriend whet to a party on Saturday night and when I called, a girl answered the phone. I heard my boyfriend shouting in the background to put the phone down. I've never cheated on him and I never would, but we don't see each other all the time as we live about 100 miles apart. I love him so much but he's broken the trust that we had. He has apologised and said it was a first time and it will never happen again. I am confused and I don't know what to do, I need advice and I hate feeling like this.