Boyfriend only dated me because of bet.

Well long story short I told my boyfriend to tell me anything that he was going to take to the grave with no punishment. He ended up telling me that before we ever got together he and my other friend made a bet saying who can f*** me first. So he dated me to get close enough to do it. Welp long story short the bet happened when he was 18 now he's 22. But I'm still pissed off about it. What should I do?
Boyfriend only dated me because of bet.
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