Why does my girlfriend family dog growl and bark at me?

Rapport
Okay so for context this dog does bark a lot for multiple reasons, like for one example he has abandonment issues and he’ll bark at anyone if they finna leave the house or any room that he currently shares with you, but in my case he growls and barks at me when Im just sitting there doing absolutely nothing. He doesn’t do this to anyone else, just me.

I haven’t abused the dog or mistreated him in any way, I’ve been wondering have I done something to him that makes him act that way, but I can’t think of anything that I may have done. My girlfriend says that he’s jealous and that’s why but I don't know.

It bothers me, it’s like my existence alone bothers him. Which also doesn’t make sense because he does like it when I play with him or pet him. He just doesn’t make any sense to me. If more details are needed just ask because ik all of what I’m saying here prolly isn’t enough.
Why does my girlfriend family dog growl and bark at me?
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