There could be a variety of reasons for her hot and cold behavior, and its hard to speculate what it might be. I would suggest continuing to text her but try to liven up the conversation topics whenever possible, and back away whenever she becomes cold so as to not end up overthinking and confronting her about it. Give her some room to ease back into this a step at a time, and try not to build up your expectations right now or get emotional if she doesn't respond the way you want her to.
If you visited this page by searching how to get your ex boyfriend back that means you are emotionally lost and suffering from painful feelings of losing the person you love most in your life. Your heart is broken because you are lonely and you are getting memories of those lovely moments that you both spend together. Now you want to fix your break up, you want to get your ex boyfriend back, you want him to crawl back to you and propose you like he did before but you don’t have any clue on how to make that happen.
You'll have to try and figure out what it was that made him break up so suddenly with you before you can determine the steps to take. For the time being, focus on self-recovery and pick yourself up from the breakup and perhaps even come to terms with it. If not, you won't be able to take the proper steps in trying to win him back. You can apply no contact for now, and when you've recovered, to attempt in re-connecting with him. Hopefully by that stage he would have unblocked you and be more receptive towards you.
How To Get Your Ex Boyfriend Back Fast