<human>: Can you condense the text into a few key points?

Hey reddit, never thought i'd end up here but here it goes:
To preface my gf is one of those really kind girls who has a hard time shutting people down because she doesnt want to hurt "feelings". 

A guy my gf has been friends with for 7 months (before we met) recently confessed his love for her and intentions of marriage about a month ago. I already had reservations about this friend but when she told me that i told her not to speak with him again and too cut him out of her life because it makes me uncomfortable af. She agreed called him telling him they couldnt hang out anymore. When she talked to me about it she seemed like she had been crying and i told her she did the right thing but she kept telling me "she hurt him" and "why should she feel good about hurting someone".

So hes been randomly messaging her over fbook, recently messaged her about a fuck-buddy relationship i had in the past with a girl he knows trying to imply that it was recent (it wasnt). "trying to look out for a freind". She trusted me and i thought that was that.

 I recently was on her fbook and saw that they had made plans to have lunch together. They didnt because she said that it was "too early and maybe later" I didnt bring it up with her but i did keep heavily implying how much i love her and trust her and how much i hate him and how it would be crossing the line if they ever hungout. She texted me later saying she is "trying" but she didnt tell me that they had made plans to hangout or that they had been talking much. Just talking about how my past relationships made her uncomfortable and its something she needs to get out of her head.

So reddit, what should i do? leave as is and wait to see if she violates my trust? Am i being too overbearing? Is this a dealbreaker?
<bot>: Gf's friend confesses love to her, she told me she would stay away from him, they made plans to get food that never came to fruition because "it was too early". Should i be concerned?