Why is my husband's friend (ex friend) upset with me?

3 days ago during a family reunion, he started acting flirtious and weird with me when my husband wasn't around. Then he wanted to talk to me in private. He asked me if I wanted to go to the movies with him on a weekend and that his friend doesn't need to know about it.

I forwarded all this to my husband as soon as the reunion was over, he confronted him and we're no longer friends. Just hour ago his now ex friend send me an upset message calling me a ''b**** for snitching on him, that now he lost a good friend because of me and that my husband told others about him, how their other mutual friends don't like him anymore''.

Why is he so upset with me? He insulted me and is upset. He's blaming me for losing a friendship with my husband. I only told the truth because I wouldn't like it if one of my friends did that. I would expect my husband to tell me immediately too.

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1 y
My husband saw his message too. I forwarded that to him too. He's going to block him now.
Updates
1 y
I hate cheaters, never understand the idea of that and if I made serious commitment it's all the way. I found it so insulting that he even thought he could get away with asking me out on a date in secret.
Why is my husband's friend (ex friend) upset with me?
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