My ex has already found someone new.

So my ex of almost 2 years broke up with me over text about a month 1/2 ago saying “he just doesn’t want to be in a relationship right now”. Little did I know that he would be talking to someone else so soon. Everyone’s saying she’s not as pretty or that she’s a downgrade in an attempt to make me feel better, but truly it doesn’t. I wasn’t even over him yet and now I have this piled on top too. I really want 2019 to be my year and I want to leave him behind in 2018 but I’m struggling with this constant sadness of the fact that the one person I want to be with is with someone else, even if she is just a rebound. How do I cope with this and just not care? Has anyone else dealt with this before?

EDIT: just last week I texted him just saying I hoped he felt better because I heard he had the flu on christmas and he responded saying that he went to this mall we used to go to and was thinking of me. It’s just so weird he could say that and then start talking to someone else so quick.