Is this friendship or something else?

I had a friend (girl). She used to tell me (boy) that I am her best friend and she shares everything with me. The downside of this is she wouldn't even shake hands with me. She wouldn't even sit on the same couch I was sitting. Lol!

She used to tell me that I'm her best friend and she does not even talk to any other guys like she does with me. The actual fact was I was her go to friend when she was feeling low or when she wanted to take all the negative things out of her mind and dump it on to me. She used to maintain a big gap between us while hanging out also. I felt too conscious around her. I felt like a creepy person around her. Honestly I did not have any feelings of any sort but friendship and respect.

During the time of Covid, she used to message me every night until 1:00 a.m. or 2:00 a.m. and used to dump all the negative thoughts on me. even when I told I wanted to sleep she would be like "if you're my best friend you're going to talk to me now".

She like the guy or maybe the guy liked her, I don't know. She hid that from me even though I was her best friend. She never told any positive things in her life which were happening, like she had a boyfriend. She got a job at a research facility, a dream job which I was also dreaming of. She did not even tell me that she got a job. She just message me after she started to go there and just told me that she got a job here. When I asked which department what is your job like etc she just changed the talk conversation. I thought she was toxic for me and my mental health and I stopped talking to her.

My question is should I have a proper closure or just let her go because I don't want to talk to a person who does not care about others.

To be honest I am suffering through depression and anxiety and one of the reason is her negativity which she put into my mind.