Why would my guy friend refuse to meet my boyfriend?

My guy used to refuse to meet my boyfriend when I first started dating him. I had known my guy friend for a year before I met my boyfriend and I guess we were pretty close (would hang out alone a bunch of times). It never made sense to me why he acted all weird when I told him I had a boyfriend and why he refused to meet him. He also told me “I don’t want anyone taking advantage of you”.

Its not due to him liking me because I’ve seen him around girls he’s interested in and he acts completely different with me.
Why would my guy friend refuse to meet my boyfriend?
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