I know this sub has probably already seen plenty of this kind of posts but I need genuine advice so I thought it was worth a shot.
I (21M) have been sharing a rather small 2-bedroom apartment with my roommate (25M) for almost a year. He's a great friend of mine, and I truly appreciate him. I had never shared an apartment before, he's my first roommate.
He started seeing this girl two months ago. At first she would spend the night here twice a week and he would always check with me beforehand to make sure it was okay (I never said no). Most of the time she eats breakfast the next morning (they have never stolen my food) and leaves at noon. 95% of the time, if they sleep together, it is at our place, not hers.
As I am typing this she is spending the third night in a row at our place. This is not a long distance relationship. For the second straight time, I learned she was coming when she crossed the door.
The thing is, I don't know what I am entitled to ask for. As I said I've had a roommate for not even a year and it is the first time he started seeing someone so this dynamic is completely new to me. And relevant info : I've never been in a relationship (he knows, I can tell him everything) so I don't even think I understand what he is going through, since I have not experienced it myself.
They haven't been mean to me or anything (so I'm not sure this is the relevant sub but wth) but I can't shake the feeling that this is not what I signed up for. But is it okay to think that ?
I'm happy for him that he found someone but where is this going exactly ? I don't think it's reasonable for me to ask him to see here less often (I don't even think that's what I want, he's happy with her) but I don't want a third roommate.
I feel I wouldn't be in this situation if I had been in a relationship before, at least I would know what to expect and what is reasonable to ask for, so that's why I'm not sure he should be blamed for anything. But here we are.
Sorry, didn't think it would be this long. He's not a bad roommate, he's a good friend, but yeah I don't understand what is happening and if I have the right to feel this way. People with more roommate/life experience than me, what should/can I do ?