I'd play the Sims because my ex never gave me attention
Why would you think your ex never gave you his attention?
Because being a male, he had a full time job and a family to suport.
Not having enough attention from someone can be nerve wrecking.  Breaking up with him was the right thing to do, he could have taken breaks to be with you. Find a different hobby and be productive at least.
Yeah, but what should I do now that I'm used to video games?
Gradually decrease your time playing the game. Before you know it, you don't even think about the game.