Am I wrong for wanting to get with my boyfriend's best friend also should I ask him for an open relationship?

Anonymous
Me and my boyfriend have been together for 1 year (but we've been secretly dating for now lets call him M). Everything was great until a couple months ago my boyfriend has been acting very two faced as in calling me a bitch and just being randomly aggressive then tells me he loves me but he never hurts me physically. Also, lately he's been pressuring me to "move our relationship to the next step". This is where his friend comes into the picture (I used to like him but for now lets call him S) I knew S before I knew my boyfriend but I didn't know that they were friends. Then my friend started liking him so I backed off but it turned out he didn't like her and recently S has been talking to me when ever he can and always is looking at me but I don't want to hurt my boyfriend because I still have feelings for S and him. So what should I do?
Break up with my boyfriend and try with S
stay with my boyfriend.
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Am I wrong for wanting to get with my boyfriend's best friend also should I ask him for an open relationship?
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