My girlfriend broke up with me last night!

I've been dating my gf for about 11 months but she broke up with me last night. Over the course of our relationship, things were rough. Around two months, she cheated on me and we broke up for a month and then got back together because she made numerous efforts to contact me and ask for a second chance. From then up until now, it took me so much work to trust her again after the cheating. Even at times now, is find myself tearing up because my mind would remember the pain she once put me through. Recently, I haven't been feeling the same with the long term success of our relationship as well and almost as if I'm dating someone just to make them happy and it because I want to be in it. I've talked myself out of this mindset and that she's a good person and things were good off and on but also, there are many qualities about her that's starting to accumulate. When she gets angry, she becomes very petty and does things almost to retaliate or emotionally withhold. Some examples would be withholding "I love you"s. When she gets angry, not even at me, she transfers that anger to me and I just have to not talk to her until she cools down.

She plays a lot of mind games with me for attention like hanging up on me while we're video chatting and getting mad at me for not calling her back and "showing her I love her". So even though I love her so much and we're very compatible on a personality level, I feel like she's just very emotionally immature and dating her is preventing me from growing as a person. I'm 19 and she turns 19 in a few days. She broke up with me yesterday because I asked that we don't text throughout the day anymore because whenever we do text, we end up fighting about silly things like not texting back fast enough or interesting enough. I told her even though we don't have to text, whenever she's free, we can talk on the phone. She didn't like that because she wants to continuously text during the day so she asked for a break. I clarified to her that a break to me means breaking up, but if what she wants is space while in the relationship, ask for space and I'll give you that. And she replied saying "since we aren't texting, a break". So I agreed and said okay, that we're broken up And she said okay. An hour later, she texts me asking to call her and I didn't respond. Then she starts almost trying to play off what happened by jokingly saying "haha stop acting like we're not dating anymore or something. Text me back". So it's like whenever something doesn't go her way, she's very impulsive with decisions and almost tries to "intimidate" me by almost threatening to "take a break" just so I'd drop my standards and be like "oh nevermind we can text throughout the day, I'm sorry". So almost throwing a tantrum while in a relationship to get what she wants. I admit I let it slide in the past a few times but this time, I just wasn't having it. So mentally I told myself I was just gonna treat this "break" as a full break up because this isn't what I want anymore.

I stayed for 11 months and grieved and forced myself to get over the cheating yet I still have to deal with a girl that's very immature with handling her anger or our fights and impulsively breaking up then coming back the second she realizes I'm not willing to chase and trying to act as if she never requested a break. So right now, mentally I'm a bit relieved that we ended things. At first it hurt a bit and I cried for the night but today I'm more at ease. I know she's going to continuously contact me in bit trying to get back together or talk her way out of it but I don't see any benefits of continuing anymore because things become a cycle. Plus a rule I have for myself is if someone asks to break up over a fight and I didn't do anything drastic like cheat, I'm not going to take them back bc I don't want to stay with someone who runs away from issues. So can you give me an analysis from your perspective of my situation and give me some advice or words of encouragement as well? Thank you so much!