Why wouldn’t my boyfriend want his friends to know about me? he says he has a girl but won't tell them it’s me?

We been dating for about 3/4 months now & he tells me none of his friends know about me during an argument, but when I go out to parties and events his friends see me they stare at me.

I’m not ugly and I never messed with any of his friends so why would he be trying to hide it it makes me feel like he’s embarrassed of me but when I asked he said no he just wants our relationship private but I’m just confused because he’s not cheating or anything so why else

Why wouldn’t my boyfriend want his friends to know about me? he says he has a girl but won't tell them it’s me?
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