<human>: F 28. Have been in a relationship with M 33 for 2 years.

I have been pursued quite persistently by another man for the last year, despite knowing that I have a bf. When he first found out I had a bf, he agreed to be just friends - we have a lot in common. He was mostly respectful of the boundaries of our friendship (but occasionally let slip his desire to be something more). He also dated other women casually during this time. 

I thought that as time went by and we grew as friends, he will lose interest. However, this doesn't seem to have happened. Lately, he has been more expressive of his feelings for me. He is convinced that we have great potential as a couple. 

I'm confused as I think I'm starting to develop feelings for him too. I am however very doubtful that a relationship that caused the direct breakup of another will last.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: have you broken up someone else's relationship to be with that person? If so, did it end well or badly?