I think my ex just hooked up with my roommate and is still at my place

So this really sucks, but I just recently broke up with my long time girlfriend who I’ve known since middle school and dated since highschool. We enrolled in the same college last year and things were going great til recently. She said she wanted to spend some time apart and find herself without me. It hurt but I was supportive cause I really don’t wanna lose her.

This morning my first class got canceled and I was feeling the best so I decided to come back to my apartment. I was surprised to see her car at my place and thought it was odd. But she does have a key still so I thought maybe she was there. When I came in my roommates door was shut and it sounded like he was having sex, but he has a fan on at all times so it’s really muffled. I immediately started catastrophizing believing it was her in there. I had an anxiety attack and went to open the door but it was locked so I knocked.

He eventually opened it shirtless and was acting weird. He had it cracked so I couldn’t see inside and seemed like he just woke up and said something like “hey what’s up?” I don’t even remember what I said next cause I my anxiety is really high but he said he was sleeping in and not feeling great cause we stayed out drinking last night. I said “oh it sounded like you were hooking up in there” and he said it was probably the TV.

I texted my ex why her car was at my place but she hasnt even read it yet. I thought about calling her but haven’t yet. My roommate just left for work but he locked the door which he NEVER does. He always keeps it open and he was acting weird af looking over at me as he left. He asked why I wasn’t at class and I said I’m skipping today. I’m still siting in my room as I write this waiting for her to come out. Maybe I’m just being paranoid and catastrophizing but something does not feel right and her car is STILL here. I feel like crying, I’m shaking, and my chest hurts. I don’t know what to do and I’m trying not to jump to conclusions but I feel like my ex is in the room over right now hoping that I’ll leave so she can come out.