I have joined this just to reply to you on this because I was exactly where you were a year ago.
Was with someone for a while who I thought was completely amazing, totally fell for him etc etc. Then he started to go distant.....me being me became more and more needy because of this and then he eventually text me saying we were done and was the distance that was the problem. Though for us it was only 40 miles away but still.
Anyway I did not take to this too well.....I even sent him a present to try get him back as well as sexy pictures which obviously he took advantage of.....honestly now I cringe writing this :-(
Anyway I tried to keep in touch with him over about a year, went on dates etc but like you, not one of them compared to him. One even picked me up in a flash covertable Audi but give me him and his Ford Fiesta any day lol. No one else was good enough.
Anyway I sort of got myself better, I found myself going a couple of months with no contact, it was always me contacting him. Never him texting me first. Until one day when I came home from holiday. I'd been using snap chat story throughout my holiday - i constantly used snap chat to take selfies of me all done up as he still followed me on it and always saw them - and as soon as I posted that I'd landed, he text me. I was literally over the moon, he suggested we book a hotel and pick up where we left off and obviously I was well up for it. We continued talking etc, he even sent some flowers to my house. We never talked on the phone, just messaging.
Anyway one day I was on Facebook and his mum popped up on the people you may know section, he wasn't on Facebook himself. Anyway I looked at her profile as you do and saw pics of my ex with his gf who had been with for months. I was devastated, I was gutted :-(
I told him how upset I was and was he sorry? No lol. Kept saying he hadn't done anything wrong etc. I wrote a massive long message out to send to his gf but I never sent it, I couldn't do it and now I'm glad I didn't. I didn't know how I was going to get over him, I still loved him even then.
Anyway fast forward a year to now and I've met someone else who I'm so happy with. I never imagined I would be but I am. Now I look back at my ex and laugh (and cringe) about how I was.
The point I'm making as I totally get how you feel right now, I really do. But you will get over it and you will find someone who deserves you. It's easy for us all to say 'get over it' when we aren't feeling what you are. But honestly it can be done. I thought I was head over heels with him but now I'm with my new partner, i realise I wasn't.
He was never going to leave his gf for me, he was never going to take me to a hotel for a 'fresh start' like he promised. I'm so thankful I found out about him before I went through with it as I would of been inconsolable probably.
I suppose it's different for you as he's been honest he has found someone else. But what I'm saying is it is possible to get over that person. It really is and you will find that too. Good luck :) x