Why doesn’t friend turn every guy down that we introduce her too?

She’s been single for five years and we haven’t hooked her up in a couple years. Every time we told her a guy was interested in her, she always says she isn’t ready or she doesn’t thing she would make a great girlfriend right now. She’s kind, nurturing, beautiful (she doesn’t think she is), smart, funny, studying to be a doctor, she’s generous, feisty and loves kids. What man wouldn’t fall in love with her? Some guys ended up falling in love with her but she rejected them which lead them to stop speaking to her. She had a boyfriend once but he cheated on her with other girls. We warned her about her ex but she didn’t want to listen. Honestly didn’t feel bad for her because she knew what kind of guy he was. We were all worried about her.
She got mad when we told her the truth but whatever, she needed to hear it. Best friends don’t lie to each other. Anyways there’s this guy that our other girlfriend and I told her about and me seemed very interested in her and wanted to talk to her. She said no. I told her, “Oh for goodness sakes woman! Every time we try to introduce you to a wonderful man, you turned them down! Just give him a chance! He’s a really great guy. He ever said he wanted to talk to you for years and he came across your profile and found you very attractive and so beautiful. Please don’t miss out on a great man.”
She was flattered but she put her foot down and said no.

We don’t know what to do anymore! A kind, good man is interested but she always says no. She’s going to miss out. She’s 30 and she isn’t getting any younger and neither are we. I told her he’s willing to wait for her. Even if it’s years. She probably rejects guys because she taller than most of them but who cares? He mentioned he’s 5’5 but I didn’t tell her that. She’s taller than most guys anyways. She’s 5’11 and a big plus size girl but she’s beautiful and stunning. I don’t know if that’s the reason. I could be wrong.

Why doesn’t friend turn every guy down that we introduce her too?
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