Gf ghosting me

So me (16M) and my girlfriend (17F) have been in a really weird spot for the past few weeks. We had been dating for almost 5 months. She isn’t my first relationship, as i had one before her that went on for almost 2 years.

We had been arguing a lot leading up to our breakup as she got very avoidant when i communicated my problems which frustrated me (i understand i should be more patient). 2 weeks ago we decided to break up and cut things off but then she messaged me saying that she missed me so i proposed a break, which she said she’d think about.

After then, she repeatedly messaging me almost daily saying she missed me and 4 days ago we decided to talk. We talked, and she said that she was gaining trust in us and wanted to give us another chance. Exactly 25 minutes later she put a long paragraph about how she changed her mind and wanted to be ‘civil’ but that we couldn’t be together.

Naturally, this was very upsetting for me and i messaged her a lot over the past 4 days just asking for closure or confirmation or anything because i found it extremely hard to build peace when there was still uncertainty about our future in the back of my mind. She has deliberately ghosted all of my messages so i just messaged her ‘i miss you and i love you and if you want to start again message me’.

I’m pretty sure she has moved on as she has removed all sign of me on social media and everything but i’m finding it very hard to deal with this uncertainty in the back of my mind as i simply just wanted to be blocked by her or be told that we are done, but she did not do this.

Stupidly, im also really missing my ex that i dated for 2 years and have weirdly seriously considered messaging her even though we haven’t talked in around 7 months and i think (?) on good terms, although im just putting this down to my weird mental state right now but it makes me feel like a horrible person for missing her as i have just gotten out of a relationship with somebody else.

Does anybody have any advice for this whole situation? There’s a lot more layers to this situation so if anybody has any questions i will answer them.