I think my boyfriend’s friend is trying to break us up, what do I do?

basically, me and my boyfriend have grown extremely close, leading to us spending a lot of time together. I've always tried to encourage him to hang out with his friends too, and he does, seeing them every day. they don’t play games together as much because he’s usually with me and prioritises me, but for the most part the rest of his friends seem to understand that and while it’s disappointing to them and my boyfriend can tell they’re still adjusting, they leave well enough alone and don’t mind me, even inviting me to play with them when boyfriend does join. one of his friends, however, makes it obvious he doesn’t like me. boyfriend has said this specific friend acts weird when any of their friend group gets into a relationship, even at points being worried he’d “try something” with me. this friend mimics me on call, makes fun of my boyfriend for talking to me, stalks my socials, and making off-hand comments. my boyfriend has already fought him over this, and is at the moment not talking to him much. however, the thing that put me off was last night, when boyfriend was declining calling them due to wanting to study, and in the gc the friend said my boyfriend was cheating on me. now i know this is entirely not true, my boyfriend spends all his time with either me or his family, always has his location on and lets me access his phone all the time (this goes both ways, we’re really transparent) and has been open about his past. this friend like i said also has a history of lying to break up relationships, and it’s worked as all my bfs friends except one are single. i’d never want to cause conflict between my boyfriend and his friends, but my boyfriend is beginning to resent this friend, and all my bfs other friends dont like the friend much, taking him as a joke. should i ignore this or do something? i have no idea what to do, i’ve never been in a situation like this before

I think my boyfriend’s friend is trying to break us up, what do I do?
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