I can’t have meant that much to him in reality and it’s hard to work out why that is. What I did wrong.
i think as days go by I wonder if I pushed things too fast.
OP - this is your poor self-esteem talking, tripping you up & making you twist yourself in knots in order to take all the responsibility.
I imagine you went through similar contortions as a child, trying desperately to hit the right - but impossible to find - note that would finally please your exacting & disapproving mother.
What makes you think that if you could have found the magic formula that prevented you from being somehow "wrong" for this man, he would have completly changed his character & suddenly become the man you wanted?
In short - why are you persisting in thinking that you should have been capable of changing him?
This is the oldest romantic mistake in the books - especially from women about men - "I'll change him!" "I know he's always been commitment-shy, but he'll be different with me!" "I know he's got a temper, but I won;t annoy him, so I'll be the girlfriend he doesn't hit!" "I know he drinks too much, but when I give him a baby, he'll stop going down the pub every night!"
It's bonkers.
It's also a trope heavily sold to women via books & entertainment media. That if you are The One, all the problems will go away.
Ergo ... if the problems don't go away, you must not have been The One for him, right?
Ergo ... rather than accept that the problems belong to the man, & we cannot change either him or his problems ... it must be OUR 'fault', & we need to just try harder! Stop being "wrong"! Don't push him too hard! Try much harder to be The One for him! Accept he never wants to go out, or meet our family! Subsume all our needs & wishes to the altar of I Will Change Him!
... & of course all that happens is you change yourself, into an unhappy creature obsessed with an unworthy man who is incapable of giving you what you want, but who you have now invested so much in, & lost so much of your confidence over, that you are incapable of leaving him.
TL:DR - it's not you, it's him.
Why are you blaming yourself for the fact that this man is a future-faking breadcrumber?
What makes you feel that taking it any slower would have been the magic formula that changed him from a commitmentphobe into Mr Right?
Why can you not accept that you got involved with a man who turned out not to be for you, & start looking forward now ... instead of this constant looking back, blaming yourself for his faults?
Please take these questions to therapy.
Until you unpick them, & your own relationship dynamic with yourself, you are going to continue to torture yourself with unhappy ruminations, & will not have the capacity to spot Mr Right - & more importantly - confidently reject Mr Wrong - in future.