Your "ex" is very weird fella
I only play dota because I am not dating any girls...
some more, get bored over the same shit over and over again after 1 or 2 matches
I think you are just too soft and I don't even think both of you behave like a couple if what you do is just seeing him playing dota 12 hours a day @.@

Now that you are alone, go and explore the surrounding around you
Read something you like, meet more people...
I think you will be able to get over with him real soon if he doesn't change his attitude