SUBREDDIT: r/relationships
TITLE: Me [25F] with my boyfriend [30 M] have been together over 2 years and I want him to stop hanging out with someone
POST: My boyfriend and I use to have this mutual friend but I stopped being friends with her and her and my boyfriend weren't really even friends. 

She admitted to my boyfriend she has feelings for him and he rejected her. Now she's starting to work her way into his life.

I asked him not to associate with her. He thinks I'm being controlling. I genuinely don't think I'm asking anything out of the ordinary. 

Am I being unreasonable/ controlling by asking my boyfriend to stop hanging out with a girl who likes him and is actively trying to get with him? What should I do?
TL;DR: 
boyfriend is hanging out with a girl who likes him. Am I being unreasonable/controlling by asking him to stop?