Search Results: reactions to cheating

Had a heart to heart with a friend at work. I told him he shouldn't still be with his fiance because she cheated on him before (a while back) and once a cheater always a cheater. I said it's likely she will do it again and I don't want him to go through that again. The conversation before that was pretty nice, not volatile at all. But once I said that statement his eyes were starting to water. (Pretty fast) He made me leave (in a nice way) and shut the door and I guess cried for a minute, then came out all sad and left for a while, then eventually came back. He was shocked that I said that, but I had to. I was very straight forward. Also keep in mind we have always had feelings for one another, though once she came back in the picture he still treated me the same, just wouldn't even ever mention her to me. I found out they were back together because a mutual friend of mine saw them together one day. When I asked him about it, he wouldn't go in detail. And avoided all conversations about her to me. I'm very giving, selfless and nice. I just had to tell him that and I got that kind of reaction. Why would he react that way?