I'm glad my former roommate hates me
What would be happy about something like that?
I'm glad he hates me because of what I did to him
You should apologize and try to make amends. It is also good to admit your mistakes and try to be a better person.
Oh I guess, I'm still angry about it.
Well it seems ab bit normal for have someone hate you a bit if living arrangements don't work out. It sounds like both of you were were hurt over what happened. Do you like your new roommate?