Tell her you don't like it and it makes you feel insecure. Also tell her you fund it very disrespectful that she's engaging with this guy one on one, and you'll no longer tolerate so you're putting a firm boundary in place.
What to do next? Wish him well and let him go. Then you stop dating for the foreseeable future and see a therapist. This will continue – either with him or with someone similar to him- unless you see your own patterns of attraction and behavior and forge new behaviors. This takes time but at some point you must heighten your self awareness. You are young so get that head start!
Tell her you don't like it and it makes you feel insecure. Also tell her you fund it very disrespectful that she's engaging with this guy one on one, and you'll no longer tolerate so you're putting a firm boundary in place.
What to do next? Wish him well and let him go. Then you stop dating for the foreseeable future and see a therapist. This will continue – either with him or with someone similar to him- unless you see your own patterns of attraction and behavior and forge new behaviors. This takes time but at some point you must heighten your self awareness. You are young so get that head start!