I hope my ex's roommate has a crush on me.
Are you hoping that this is something good?
Yes, because I don't fucking care about anything as long as she doesn't even contact me.
I understand you're disappointed in your last relationship, but it's not good to use your ex's roommate to get back at her. Are you seriously interested in her?
I'll do what I want. I'm her ex-boyfriend, so she can't do anything to me.
That is a bad way to look at things. It's not good to carry disappointment from a past relationship into the present. You should want to do things better the next time around instead of getting revenge.