Boyfriend wants me to choose between him and my cousin?

Anonymous
He wants me to cut off my cousin.
I used to have a boyfriend last summer, I had some problems going on and we were on long distance, I cheated on him. I really regret it. He found out when we met and I begged him to forgive me. We stayed ”friends” but we still had feelings for each other. I'm aware that I broke him, I really love him and I tried to make it work. I'm a whole different person now and I want us together. After months have passed everything started to get better we were basically dating but just with no name. Everything was perfect until we went to our hometown for holiday. He started to act like a douche and broke my heart. He told me that he loves me and wants to spend his life with me but there's only one issue. He hates my cousin and wants me to cut her off or he would never talk to me again. (He blames my cousin for me cheating on him. I went out at nights with my cousin all summer and she made me met that guy I cheated my boyfriend with. I went to my hometown with my cousin and I started seeing her after months). She is a really close family member and it's not possible for me to ”choose”. Even if I want to cut her off it's not possible for me to ”never see her again” because our parents are very close and meet often. I tried to explain him that but he doesn't care. He says she reminds him of being cheated again and again and he will never be mentally healthy if she stays. I told him I can see her less and put distance but he still doesn't care. He wants me to choose or he will cut me off even though it would be painful to him. If I choose him we would get back and have a great life together. Everything was going great I don't know why this came out of nowhere. I know this sounds stupid but I'm in love and I don't want to lose him. He is my first love. I'm really stressed due to in this case I don't really have a choice. I feel like I'm never going to be happy again. Please tell me what to do
Boyfriend wants me to choose between him and my cousin?
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