If a friend warns you about dating a guy, should you believe him?

Anonymous
So this guy friend who I'm very close with told me not to date this guy I'm seeing. He said that he is "crooked". I asked him how and why, and he said that he would tell me later. I know for a fact that the guy I'm dating and my guy friend don't really get along with/like each other that well. The guy I'm dating has told me that my guy friend is a violent drunk who beat up one of his friends while drunk, so

I really don't know if to believe that there is a legitimate reason or if he's just saying that because he doesn't like him.


Updates:
+1 y
I also asked him if I was in any danger and he said "No, he's harmless. I just don't think you should date him."
If a friend warns you about dating a guy, should you believe him?
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