My boyfriend wants a threesome should I breakup with him because of it?

I used to have relations with this girl in high school. She was the first person to ever give me head and she took me on a few dates. She was really pretty but she had this weird idea about wanting to turn girls out and feel like she was enticed by the fact that I was innocent. We never kissed on the mouth and I never returned the favor she would just give me oral and ask to try things on me. I had never been in a relationship and I did like boys as well but I was shy. a lot of people thought I was this pretty innocent girl and although I fooled around witht that girl I still felt innocent. We lost touch after high school and I met this guy who was my first boyfriend. I have feelings for him and he was my first kiss as well as the person I gave my virginity to. I never told him about the girl until she called and asked me to leave him and get with her. He was excited about the information and when he saw her on social media I could tell he was attracted to her. But she is 100% lesbian and I am really possesive over him. I think because I told him she wasn't somebody I was serious with he assumed that it was okay to ask for a threesome and I got offended. She wanted me to leave him and he was asking for a threesome with her! I felt like he only asked because he thought it was okay since I had messed with a girl before. I also had a girlfriend before him but we had merely dated for a few months we never even touched each other. And I never knew love until I met him. And it hurts me so much that his eyes are on other women and even though he is asking for my permission I feel like he sees me as a stranger again and not like the naive girl he met who had neved had her first kiss and who he thought he could take home to mama and who was shy to be in bed with him. My fear is that he sees me differently and that he wants to adjust the relationship to fit his sexual fantasies and I love him so much but he is blatantly asking to cheat on me
My boyfriend wants a threesome should I breakup with him because of it?
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