So this girl who is my boyfriend's best friend confessed to him a few days ago that she's in love with him. She knows that he's taken. This girl is making me uncomfortable. We are all in our 20s.

He told her he doesn't want to be with her and he showed me that she texted him saying she will leave us alone.

2 days later she called him at 3 am asking to meet because "she's crying and cannot sleep"

Like what?? She wants my boyfriend to baby her to sleep?

My boyfriend told me he's going to see her. I told him I'm not fine with it but he says he already said yes to her so he felt bad cancelling it because I said no. He promised me he only sees her as a friend.

Can you help me make an argument how I can tell my boyfriend why it's not normal and disrespectful to me?

Edit: They had a thing before but didn't work out and stayed friends. Ever since we started going out she has been trying to get him back