How to deal with my close friend without being impulsive?

I broke up with my fiancee 7 months ago. We have been together for 5 years. My close friend was pushing so hard for me to break up with her. We had long distance relationship for 2 years and we had issues and he thinks I should break up with her. I end up breaking up with her. She tried so hard to get me back but I always reject her. During this period of time she met my close friend couple of times. She is back to the city where I live and she has no friends. They hang out and I was aware of that. We had issues but loyalty was not one of them and she is not the slutty type of girl. During this whole time although she knew that this close friend pushed hard for the break up she never talked trash about him. We recently trying to get back together and I came to know that onr night they were hanging out together and while saying goodbye he hugged her and told her "before I was lonely but with you now I am not lonely anymore"

I need an advice on how to deal with this situation

Updates
1 y
And when he meets her he tells me how she is annoying and meeting her was a waste of time and he won't meet her again. That's what puzzles me
Updates
1 y
My fiancee didn't try to sleep with him. They are friends since a long time. She had no one when she came back to the city. She is definitely not that type of girl. How to deal with this friend. Should I confront him
How to deal with my close friend without being impulsive?
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