My boyfriend found flirty convos on his bestfriends phone from me what do i say to him to make things ok?

So i love my my bf to death! but some time ago his bestfriend started texting me nd telling me he fell for me nd its wrong but it feels right , he always says he loves me and im his everything and most of the time i just tell him no but one day he made me feel like i do love him nd have feelings for him he's a great guy just like my bf ... wen he first strted telling me he loves me i told my bf nd he sed wenever he strts talkin to me like tht i shud end the convo so i said ok.......... yesterday the bestfriend went to my bf's house nd my bf went thru his messages nd he got really angry and through his friend out. :( so his friend texted me nd i called my bf hes never been angry at me ... i f*ed up and he said he doesnt trust me and how cud i with his bestfriend then he sed he didnt want to talk about it anymore nd he got off the phone, shall i give him space or not? what can i do i cant lose him! (to make it worse his bestfriend said he doesnt want to lose him either but he cant help that he loves me nd he still loves me ) :'(