Should I tell my boyfriend about my past hookup with a friend?

I am in a 6 month relationship with the most amazing thoughtful man. I think I may have finally found the One. I think we are building something that could lead to marriage.

My question is that I am still friends with a college friend I slept with twice in the past 2 years. I have no sexual or emotional feelings for this friend other than friendship. I've told my boyfriend that I have a friendship with this guy, but I don't know if I should tell him about having slept with him. This friend and I have been friends for 6 years and 2 years ago we slept together on 2 separate occasions.

I have been honest about other past relationships, but I feel that my past is my past. I slept with this guy during a lonely time in my life and it didn't mean anything to me. This week my boyfriend and I are attending a small dinner and this friend will be there. They will interact. Do I tell my boyfriend about me having slept with this friend or do I keep it to myself?

My boyfriend and I attended a dinner where a girl that he used to hookup with was there. He told me beforehand and for the next few weeks it killed me to know that he used to sleep with her. I couldn't get the image out of my head and kept obsessing. I don't want to put my boyfriend through the same thing if sleeping with my friend meant nothing to me. But at the same time I feel like I would be lying by omission if I didn't tell him.

Do I tell him? If you were in a serious relationship would you want your girlfriend to tell you?

Should I tell my boyfriend about my past hookup with a friend?
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