Disclaimer: I speak as a 50+ (French) dude happily sharing his life with his spouse for the last 25+ years and counting.
I am getting over it
This may take time. What you need to not do is ruminating. Once a story is over, no matter how heartbreak it feels, it's over. The more time you spend grooming your nostalgia and regrets, the harder it will be to move on.
If you want something, you do everything you can to take it. He just wasn’t emotionally mature and it sucks.
I will completely disagree with this. Maturity is not doing whatever is required to get whatever it is one wants. Even less so in a relationship. Accepting the other is not the perfect faultless ideal person one may dhave dreamed of and then being able to listen and accept the other's limits, doubts, fears and, obviously, feeling that it's ok to share yours as well, is what maturity is supposed to be. At least that's how I see it.