Hi there, and Welcome to YT !
You have already recieved a lot of wonderful advice. Your new puppy will attach himself quickly to the first person who spends the most time with him. He is like a new human baby. Very needy and demanding. I am not surprised by the little puppy's behavior one bit .He is so young, and everything is new to him, being in a new home, and new people to bond with. He obviously has really connected to you, which I thi8nk is natural.
In time, he will also bond to your Girlfriend .However, she needs to also take interest in the puppy. She has to play with him, feed him, pet him, and hold him as much as possible. Give him affection, treats, and be there for the little puppy. He will love the both of you.
My Suzi loves me , and she and I are bonded by the hip. LOL. However, she is always exptionally happy to see my son, spend time with him, and can't wait to see him every day when he returns from school. They are both very happy together. ANd share a close relationship too . Although, Suzi still sleeps on my bed, always runs to me after spending time with my son in his room, Ect>
Suzi is a people person though, and loves it when anyone comes over .She can't wait to jump in their laps and lick their faces if they let them!
I do not think all Yorkie's are like her with people though . And Suzi is not this friendly with other dogs. She is shy .And more stand offish.
Congradulations on your new puppy.
