The Flamingo

I was in your situation before, trying to deal with a sudden stranger in the house my parents had built together. I don't think you're wrong. You're actually being quite respectful by the sounds of it, trying to be tolerant for your mom's sake even though the situation makes you uncomfortable. Just don't put yourself out too far... you have the right to voice your discomfort if he's being pushed into your life and you aren't ready for that.

...Sorry. Nevermind.