I'm broken and can't recover?

Okay so 4 months back we broke up and the relationship was intimate but something was not right and we almost had arguments and what not, she started to pull off and I started to try and fix this now she's with another classmate of mine whose been her best friend since the beginning.
I've tried everything to move on but she would drop hints that she still misses me every now and then whenever I start to feel okay and this breaks my heart further.

So we had this final argument and now we don't talk at all but somewhere I still feel broken and my self esteem has taken a hit to the extent that I don't find any reasons to exist or maybe focus on productive things.

How do I deal with this please suggest.
I'm broken and can't recover?
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