Is it reasonable to fall out of love with a girl after finding out she seeks attention and affection from other guys amidst a relationship?

[desirement]

I dated a girl for around 1 to 2 years before finding out that she spoke to a lot of other guys, never intimately or affectionately but her friends had told me she liked them before we started dating, and every time I'd come over she would always speak about guys she saw on her favourite show.
After learning about all of this I started slightly distancing myself and overtime built the courage to break up with her, she threatened to kill herself if i left and now she's dating my bestfriend.

 

[maximuslaid]

Youre a cuck if you still tolerate her behaviour

 

[vux]

Relationcucks stay getting played by fefails