<human>: Can you summarize the given text in a few sentences?

So I got a rescue dog, he's a Jack Russel mix. Here's a pic of the guy 

Issue is, he absolutely loves my girlfriend but seems to be afraid of me. I've had him for two weeks, and I take him out a lot (to walk around this big lake by where I live), I try to play with me (he either sits down, or keeps backing away from me) and I give him treats when he is acting good. When my girlfriend is around he seems to be a bit more comfortable and will even sit next to me, but when she's at work (she's a vet tech and works a lot) he goes right back to being afraid of me. She doesn't think it's that serious since he's better when she's around.

He also seems to be a little skittish whenever there's a loud noise.  The thunderstorms everyday don't bother him, but knocking over a empty can makes him freak out.  Even moving my leg when I'm sitting down causes him to jump up.  Again, this behavior happens a lot less when my girlfriend is around.

Question is, what can I do about this? I'm trying my best but I've never had to deal with a dog that just doesn't seem to like me no matter what I do. I have a chocolate lab and a min pin at my parents house that love me (min pin was a rescue, lab wasn't).

Any advice, what should I avoid doing, should I do something in particular, etc.
<bot>: Got a rescue dog, he loves my girlfriend but seems to be afraid of me, or in the very least incredibly indifferent. Advice?