I should tell my crush that his girlfriend has been seducing me?

Anonymous

I like a boy from college but I never told him because he started dating a girl and I wanted to respect their relationship. I met them on summer vacation (I was with my family and they were on a couple's trip). They came to the house my family rented one night when my parents and siblings were away and the three of us ended up having sex. We are from the same group of friends so we still see each other frequently. The girl has become very close to me since then, sometimes she comes and stays in my room to sleep and her boyfriend knows it. A few nights ago she came to stay and tried to have sex with me and obviously I refused because I respected their relationship and also because I have never been alone with a girl. Should I tell the boy? I don't want to be swayed by the fact that I like him and ruin their relationship in case it makes him angry.

I should tell my crush that his girlfriend has been seducing me?
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