I have a freind that always cheats on girlfriends? Sex addiction? Other?

I would think it would have

I would think it would have to depend on why this person is cheating? Is there a rush that they get from doing this maybe thinking your friend will get caught. Could be similar to a rush people get from actual drugs.

It really depends if he can

It really depends if he can control this behavior. It seems though that this a symptom of sex addiction.

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