Girls, Why does she keep my friend request pending and not delete it?

Anonymous
I met a girl in college years ago , we would always check each other out but we was both shy so didn’t talk. She sometimes got visibly jealous seeing me chat to other girls , would always look at me and get shy.

After a while I got my strength up and went to introduce myself. I was shy and lost my words but I made it a routine every lunch to sit with her and talk.

I would call her beautiful and she was nice to me. It was clear she was really shy. But then she would act hot and cold. I found out she had a boyfriend and did not tell me.

One week she made effort with make up and was hanging out waiting for me to come at lunch with her friends but I didn’t turn up this time. She was upset and kept staring at me.

I avoided her for two months which she seems upset about when I saw her next. Friends told me her boyfriend was manipulate and controlling. Made her choose a university closer to home to suit him.
I tried to add her socials , when she split up with him she accepted me then he made her delete me when they got back together.
I added again weeks later, she still has me pending. But she’s now single. The guy who was controlling and manipulative is now with another girl. But she still has me pending and accepted other guys she doesn’t even know (doesn’t follow them back)
why does she keep me pending , then accepted and keep me pending again. Why not delete it or block me?
Girls, Why does she keep my friend request pending and not delete it?
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