Well. @CWOTUS, I can see that as being a very justifiable reason. My ex was very well endowed, and on occasions, when he got a little too excitable, having my head rammed into the headboard when he bottomed out, was not fun. His size wasn’t so bad it would cause me to end our relationship, but I can quite understand why sometimes, ‘enough is enough’.
I broke up with a man because he couldn’t kiss. I feel mean now. I was young and cruel.