how can we get over my sexual past

Here's is our situation...my bf and I have been living together for 6 months, we have 4 children (2 each) and we are very happy with our relationship except for one issue that won't disappear or at least not easily or without some help. Very shortly after we started dating, I told him - thinking it wouldn't be a big deal - that I had in my past been intimate with another woman and had a threesome with her and her bf on a couple of occasions. So, it was her separately and them together as well. (a side note - I was single 3.5 years prior to my bf and I dating after a 10 year relationship ended with my children's father) He was and has been very torn with this information I told him. I just offered it, I didn't try to hide it and acted like it was no big deal because I really thought it wasn't. He believes that I am bisexual and that he can not compete with a woman and me wanting to be with other woman. When he put it like that and reversed the scenarios - ie. him being with another man in his past, how would I feel and would I not be worried that I could never provide him with his needs or desires... I agree that me saying it's different is a double standard even though it is more common and socially acceptable for women to be together sexually. For me, I did regret the fact that happened after the first time. why did I do it again? I think I was trying to prove to myself that I'm not wrong or bad and that it was okay even though deep down it wasn't okay with me. I had never wanted or fantasized about being with another woman and it certainly wasn't my idea nor did I instigate these situations. I am absolutely not blaming anyone for this happening. I'm a big girl and I should have made the decision to remove myself when I felt uncomfortable. I have tried to tell him that its not what I want, that I am not bisexual. that I am only attracted to a man's body and him. I have always been faithful to my partners and have never thought about breaking that commitment - I would never cheat on him, ever. He is afraid that he will never be able to live up to my past in the bedroom - and I'm trying to tell him that he is everything I have always wanted. He is a great lover, generous, romantic, sexy, affectionate, adventurous - I have no problems what so ever with us sexually. not to mention all the other wonderful other things that make me love this man - great father, smart, funny, hard working, athletic, I could go on. In fact, there isn't anything at all about him that I don't love! my question is - how can I help him get over this and just accept my past as my past? How can he become secure enough with our relationship to believe that if that is what I really wanted, i would search for that and wouldn't settle for someone that wasn't into that as well. Like most men, that has been one of his fantasies to have two women, which I am considering doing for him so I can fulfill that for him - even though I could never do that again and be very okay with it. I don't know if that is the right thing to do.. I think he just wants to do that to say that he has experienced the same thing as I have. I have also suggested talking it out with a counsellor.. I'm looking for others advice as well, what should we do? thank you

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