I'd love some impartial advice. Please help me to see beyond these choices.

The situation:
I live and work in Japan. Have only been here for 18 months.
My contract is per year and I must soon decide to stay another year or return to the US.

Should I stay or go?

Pros on staying in Japan:
easy job, good pay (im saving alot and paying off college debt)
i enjoy life here (it's clean and safe)
my boyfriend (he's the best man ive been with)

cons for returning to us:
complete life upheaval (ill have to find a new home, new job, ill be single- long distance relationship is not an option)

Cons on staying in Japan:
this job has no longterm career potential
i feel as though i am delaying the search for a job i truly love
i am close to my family and being away from them is difficult

Pro on returning to US:
ill be able to start a new chapter in my life

thank you.