Three somes am I wrong for not wanting them

I need some advice i was in a previous relashionship on which I had my ex try to force me to have sex

I said i wasnt ready and that I wanted to wait to marriage bit after a while o thought that maybe I would feel a bit more comfortable as he was the first guy who I had dated that long and thought he cared

I said I would want to wait atleast a year before sex and he said no he said that he would change it and make it a few months I wanst sure how to feel I cared about him and wanted him to be happy however he started making jokes to his friends about what he would do and it made me incredibly uncomfortable but what made it worse was that he said he wanted a thressome and tried to convince a mutual friend of ours to convince me to do it

It made me so angry and made me feel like i wasnt enough he tried to explain but that was the last straw and I broke up with him

And I know thay alot of people talk about threesomes but they make me uncomfortable im bi and I think he wanted it to be some other girl with us and I dont want thay with anyone I dont mean to offend those who like that kind of thing but I feel so uncomfortable with that situation and I just want some advice ive desided that if I made a promise to myself to wait till marriage then ill wait but I would also like to know if theres other people like me who feel the same way about therresomes