I feel like my boyfriend cant get off to just me anymore

Al

Hi ladies! so we've been dating for 2 years, we've had a couple 3 ways with my friend and now whenever we have sex he closes his eyes and pretends shes there with us and he talks about her as if shes there, whenever he has sex dreams shes there with him and I. It makes me feel like just me isnt enough for him anymore. Am I overreacting about this? What should I do?