Do I have a chance?

My ex broke up with me almost a month ago now. He claimed our personalities didn’t match. I find this contradictory because we had so much fun together, could talk for hours til the sun came up, etc. We really did have a great relationship. I did show him lots of affection and let him know how happy I was. At the end he seemed to have forgotten all that and only remembered the negative.He said he loves me very much but doesn’t think we would work. Said he wasn’t happy anymore.
We were together for 10 months and spent a lot of time together and even went on two vacations together. He said he’d never really been in love til me. He used to tell me he loved everything about me. Even talked about marriage someday and moving on together someday.
I was pretty hurt after we broke up and called him a narcissistic asshole. Well because his behavior changed from how he used to be and that’s how was being.
I went no contact about 3 weeks ago. It’s been so hard but I know it’s necessary. Not only if I want him to miss me but also to prepare myself to get over him if there’s no chance for a reconciliation.
He still has my friends and family on his Facebook and even changed his profile picture that was one of us but I’m cut out.
He’s been posting memes that refer negatively about our relationship indirectly without saying it.
Is he trying to get over me by using this woman as a rebound? I think it’s so soon for him to jump into something else.
After no contact is up should I contact him even if he’s dating that woman? I miss him very much and hope maybe someday we can work it out. Maybe I’m just hurting myself more and a fool for thinking I have a chance.
Any advice is much appreciated!

A couple days ago he posted a meme about kissing and this new woman responded "haha, I see what you DoD there