AIO my best friend and their boyfriend had sex while i was asleep in the same room

this happened over a year ago and i never told anyone about it until yesterday. my now ex bestfriend (for unrelated reasons) had a very strict mother so i would let them bring their boyfriend over to my house sometimes when we had sleepovers. one time i fell asleep and the next morning my best friend told me they had sex with him the night before while i was asleep like 10 feet away. in my own house that i invited them to stay at. they thought it was funny and i just didnt say anything about it because i was so uncomfortable. theyre not my friend anymore for other reasons but i was made so uncomfortable by this i felt gross and couldnt talk about it for a long time. i finally told someone about it yesterday and she told me it was wrong of them and it made sense that i was so disturbed by it. i dont know. do i have a right to feel so uncomfortable and gross about it???