What do u think off this situation and how could i get him back? ill answr urs!?

I need your guys opinion on something. I made a mistake by dumping my ex. He was so nice, funny amd we could talk about anything. We only went out for 2months but it was a good relationship and everyone of my friends thought it would last a good while. The reason i broke up with him was because after one night out it seemed like i was held back and couldnt go about meeting other guys. I know this is a horrible reason and he dersevres much better than me but i still want him. He was crying when i broke up with him and asked could we ever get back and i said no which i regret. Which made it wprst was that i kissed someone else the day after the break up (i meet him that night out but didnt kiss him) and this brought my ex to tears and even talked to me about it.. i told him to move on and it none of his business and he told me he still wanted me.. Looking back i feel like such a ***** and i know i dont deserve him but im truely sorry for all the pain i have brought.Over the next month things changed with him. He was being friendly towards and always had a laugh with me and actually had decent conversations with me cause are in the same school (both 18). He started doing all this new things. he began football and started going to the gym and even is doing a charity sky dive and other things and to my knowledge kissed someone else. He seem so happy about his life and everyone in my school year thought he was great and a really decent guy which he is.It was ever since the fromal that i couldnt stop thinking about him. We went together as friends and during the slow dance i felt something. I even tried to kiss him but he moved his head and said no and walked away.. I now know i treated him like crap and he deserve better than me but i really want to try with and i know im ready and i want to have something better than last time. He was my first bf and one of only genuine guys i know. I know you may think he better off but how could i get him back? any ideas? :)