Just thinking about my past relationship

Sorry I am new here and don't really get on reddit much but i just had to rant somewhere. So I had been in a relationship with this girl for quiet sometime before the breakup, we were actually in a situationship which fortunately or maybe unfortunately turned into this mess of a relationship. In the last three years I have gone through four breakups including this one but for some reason this one impacted me the most. Whenever I shared this breakup story by this point someone asks what was the problem and to tell you the truth; I don't know.

I wasn't able to give much time to my ex because of studies and stuff so in order to not make that mistake again this time I went above and beyond to make time for her but at the end the reason she stated for the breakup was that I was too clingy. This episode was on last Saturday when she didn't pick up my call. I just texted her as to know where she was but instead got the dreaded, "I wanna breakup" message. I gave her the space she wanted and I was like okay it's time to move on but she randomly texts me nowadays and disappears. She also says she doesn't want to talk because it was her fault because all this shit happened and that she didn't want to hurt me anymore. She still messages me and sometimes double texts but hasn't called yet. I reply and then she disappears again and I am at my wits end trying to understand what is even happening.

I feel depressed as it is because I really thought she was the one and on top of that she just isn't communicating about what she wants. Any advice will be appreciated. I know i have put all my efforts in this relationship and there's really nothing else for me to do but i just miss her and sometimes she gives off the same energy of wanting to talk whereas at other times she just gives me the cold shoulder. I might be going crazy at this point trying to figure all this out.