<human>: A few weeks ago my wife admitted to me that my best friend, (let's call him Marcus) told her he has been in love with her for a long time. She admitted to having some confusion because she always saw him as a brother, he is also the father of her sisters baby so naturally they are good friends as well. He kissed her a week after he told her and asked her to marry him as well. She told me she pulled back from the kiss and told him no on the marraige because she was happy with me and didn't want to be with anyone else. I told her I appreciated her telling me and asked her to not talk with him anymore because I no longer trusted him. She told me she can't do that because it's her sisters boyfriend and baby daddy as well and that she doesn't want to tell her sister because she didn't want to ruin them. She said she still wants to hang out with him and when I said I would rather her not she got mad and said I don't trust her. Which isn't the case. I don't trust him. Am I being unreasonable?

Also I wanted to throw in that she did cheat on me once at the beginning of our relationship but she came clean with me after and I forgave her.

Condense the text into a few key points
<bot>: my wife wants to remain friends with my once best friend after he admitted to having feelings for her and got angry when I said I would rather them not talk