Getting over "the one"

My ex broke up with me, we would have been together technically for two years, we split up after a year but then got back together for another year. This time has been so much harder for me because he kinda lead me on thinking we had a future together and I thought we had a strong connection, we've been there a lot.

Now we've been broken up for 2 months and somehow I agreed to be in a casual relationship with him. I just feel so lost and sad. I don't know how to get over him, when I still want him in my life but he probably has moved on already. Sorry this is long, I had to get it out.

*Thank you so much for the comments! I'm going to try my best to keep going.*