Boyfriend tried 3 some...

So I’ve been with my SO, 3 going on 4 yrs. he knows that I’m attracted to girls but knows i would never be down for a 3some. Just not my style.. so i recently made a new chick friend. Maybe known her like 4months.. so she came over to wash and style my hair for me. My SO came home and saw her... but im going to skip the middle patrt. Long story short, he tried to get us to have a threesome and when i been told him that i would never do that. But the whole while I got the vibes that they had been talking about this already and basically ambushed me.. no I didn’t do it because i was not comfortable in the situation. I am so disgusted with my boyfriend. I am not speaking with the femlae anymore either: I really want to leave him..