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Just make sure you don't restrict yourself during this process.
If you feel sad, hurt, mad about her, mad about the guy, feel you just don't want her to be talking to him any more, whatever it may be (I'm not saying you do feel or think these things, just as examples things people might want to avoided feeling or thinking), just allow yourself to feel and think them.
Don't act on them, don't say anything to her while still in this process, but really dive deep into yourself. I think there'll be good surprises at the end of the tunnel. 😄😄
Btw, maybe fear of losing her is one of the underlying reasons?