Would you get jealous?

I was sort of talking to a guy from my gym - its just sexual but we mostly text. we haven't done anything as he is a virgin. But guys at the gym literally follow me around and flirt with me. so far 9 guys have talked to me infront of him within a month. He always backs out when we are gonna so sexual stuff so i called him out on it, then when i tried again he sort of cut me off. I saw him at the gym and another guy kept talking to me and helping me with my workout, racking my plates and all. He was there the whole time just working out but he could also see us. Do you think hed be jealous even tho he is the one who backed out? or do guys not care about girls like that when its sexual only?
Would you get jealous?
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