Yes I have I broke someone's heart when I got married. That was over 20 years ago. I got married because I wasn't really out yet and I figured I have enough going on with my tourette's I didn't need being openly bi as well. It broke his hurt but he got over it. We are still very close today.
I rejected my best friend because I didnt like him in that way , I didnt regret it but what he did in turn were just uncalled for. I were nice to him and told him why , I promised to still be his friend and hang out with him but he couldnt handle it at all. I dont think anyone had ever told him no before.
Some say they do but some don't care.. they are the hit it and quit it type maybe idk or maybe something was off in the relationship or maybe it was just them..