Wrong or immature!

I was seeing a guy for 9 months or so and 8 of those said months were fantastic. I struggled with a few personal things I kept to myself, and it took it's toll on how things were between us. After it was a little too late, I sorted myself out but the cracks had already formed and things were beginning to fall apart until I finally grew the balls to initiate 'the talk' about us. After about a month he deleted me off Facebook, I questioned it and he explained he was seeing someone else. We've barely spoken since because I'm nervous to initiate contact because although we still remained amicable I wasn't sure whether he wanted to even speak to me again. It's been about 3 months now since ending things so I feel it'd be a bit awkward to initiate conversation now anyway. 
ANYWAY, is it wrong to hope that things with the girl he's seeing don't work out because I want to prove what we had is salvageable and worth it, my situation has changed and I'm confident in saying I'm a better person now who brings more to the table than before and can make him even happier than before. Or is it just a little immature of me to hope these things? 
I know he was a better person around me, his friends admitted that and when he was drunk and hurt I was the one he called despite his mates having been through thick and thin with him. Anyone with a military S.O would understand the bond they share. And he's made me a better person too, and I think that's one of the most important things in a relationship, bringing out the best in each other and bettering each other.
I know life goes on and there's plenty more fish in the sea but without him I feel like Dory. And that's with having been on a few dates and meeting plenty of new people. At the end of the day it's still him I think of. 

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