How do you get over someone you still love?

Wise words - and certainly true. On the other hand he is not just a flatmate and I care about him. But maybe this care is destructive for him and me as I'm afraid to tell him what I really think.

I know what's coming. He will demand and explanation over and over. I know I shouldn't sugarcoat but on the other hand I don't wanna go off on a rant and tell him that he is a horrible person.

What you're after here is the old classic: "It's not you, it's me" exit strategy.