I feel for you having to go through this... if we switch perspectives to a straight man befrending a 17 1/2 year old lesbian he had stuff in common with.. and remaining friends until she was 19, at which point she felt uncomfortable with the straight man being friends with her.. maybe we can see things more clearly.

Maybe she is uncomfortable with her sexuality and doesn't trust herself, or him. Maybe she thinks he has alterior motives.

Sorry you had to go through this.. it really sucks :notsure: