Is it wrong to get with a best friends ex?

So I’ve been talking to this guy for awhile and well we started of as friends but he never knew I got feelings. About 2 weeks ago him and my best friend broke up. We continued to be friends and then I told him that I had feelings. We hung out yesterday and made out. My best friend found out and cried and then said “shit happens” I hate myself but deep down I want to do it again because he makes me happy. I don’t want to hurt my friend but I don’t want to follow my heart. Am I a bad person for trying to get with him or is she a bad friend or am I the bad friend. Their breakup was a mutual decision. Please help me out.

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