Why does he behave like this when I mention other men?

Once when I mentioned another man I previously had an interest in to my friend and I told him that we fell out, he just walked away from me without saying anything to me. Recently when I told him that my ex just had a heart operation, he just said, "Oh dear" and that was it. He didn't say anything else or look at me when he said, "Oh dear".

Why did my friend behave like this with me?
Why does he behave like this when I mention other men?
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