<human>: My ex of 9 months dumped me about 2 months ago. It was a very messy breakup because I was pretty sure she dumped me for another guy.

One weekend she goes to a party and she got drunk as hell (I had work that night but she was going with close friends I knew as well) and she dumped me the next day. She said she was stressed out with a lot of things and wanted to move on. I went through absolute hell following the breakup whereas she didn't cry a single tear. By hell, I mean I was so emotionally exhausted by her constant lies and nonchalancy.

However, following this breakup, for about 2 weeks she would constantly obsess over this guy she met at the party. I didn't go NC because I thought we could stay somewhat distant friends but I always brought him up and sort of/not really accused her of cheating but she denied everything and said he was just a friend and all this bullshit.

Anyways, I went no contact for about a month after I decided I was done with her manipulative, lying bullshit.

She called me on NYE. I picked up because a few days before this, a friend of mine told me she wanted to seriously talk to me and sort some things out. My mistake. We talked and she said she only called because we left on bad terms and she wanted to stay friends. She also told me the honest, BRUTAL, truth about how everything I accused her of..was true. During this call I didn't say anything because the 1 month of no contact was healing me and I thought I didn't care about it anymore. 

Turns out shes been in a serious relationship for about a month now with this guy. I'm absolutely pissed at this because she wanted to stay friends but during our post breakup period she lied straight to my face about having feelings for someone else.

I've since then thought about this and I feel very bothered and unconfortable.

Anyways, my minds a mess right now and I need to let out what I feel about her to her. 

Sorry if things are missing but

Can you succinctly summarize the text in 1-3 sentences?
<bot>: gf dumped me for someone else, lied to me constantly following breakup and finally told me the truth after 1 month of no contact. I want to express my anger and hate to her.