Should by bf say that he will be spending the time with me instead?

My bf is invited to his friend’s birthday party. However all of the girls in the group have a history with him. I’m not invited and I don’t feel comfortable knowing that he would be with those girls. I don’t trust him but I’m pregnant and I need to be with him until I can settle down so don’t ask me to leave. It was his own decision to not go. He asked me for a good excuse and I said ghat he should say that he had made plans with me previously. He wasn’t a good bf before and sort of hid me from his friends and shit. So I would like if he shows his group that I’m also important. He hardly sees me anyway so if he isn’t going why not just say that. But he said that if he says that his friends will guilt trip him and say that he should rain check with me. I don’t like his company. They are all rude to me and never greet me. I hate my life so much. Idk what to do. Do you guys agree that he should say that he is going to spend the time with me instead?

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