Destroyed

Yesterday my boyfriend and I was heading out to my doctor appointment to get blood work. I am currently 7weeks. As I'm getting into the car I saw a number with a female name on it & i questioned him, he seemed to get very hesitated and started making up lies & told me to call her. So I did! She started saying how they been seeing eavhoher for over a week now & I didn't know what to do at the moment. I got very upset and started crying. He then drove back home & started packing his things like he was guilty; I don't know what to do. We haven't spoke since yesterday morning. I am feeling so sick and upset that this female works right next to him so there always going to be communication with them. Tomorrow his mother and him want to speak to me and my mother about the baby and other things. I'm stressed & honestly don't know if I should keep him around and try to believe in him. HELP! I believe he just wants to get things better because without me in his life he has no car and no place to stay. I'm in a awkward position ??