I moved to Canada last year with my fiancé. Similar quality of life, not a drastic change culturally. At the time I was all for it, very happy. I loved it. Even immigration wasn't that hard, I just applied for a common law working visa. DP did everything for me, organised flights, etc... We're currently living in his parents basement, pay them rent but it's not extortionate. We do have space of our own.
I came back to the UK for a week for Christmas. And leaving was so hard.
I do love Canada, the mountains, the lakes, the views. But I miss so much.
I miss people getting my humour, I miss my family, I miss everything being so simple. I can't get a car loan, let alone a mortgage. I have no credit and I'm not a permanent resident. I find people friendlier on the face of it, like strangers- But it's not as social, everyone is more self-contained. I don't socialise after work, no one goes to the pub, no one initiates social contact. And it's not just me being 'new.' I miss the raucous, pub trips, the smell of the rain (it barely rains here) and my friends and family.
Being home was so nice. I was sleeping, chatty and happy. Now I'm back, I just feel very on edge and raw.
I'm not happy in my job here and I'd love to do a master's, but I can't afford to do it here. I'm only in my mid-20s and I know I'm not a child and I've moved out, but I just miss my family, family life and everything.
My DP doesn't like the UK though. His grandma is Scottish, so he's spent a lot of time here and is adamant he doesn't like it.
I moved of my own will and I did enjoy it. But it's not home, I don't want to spend forever there.
It feels like my only option is ending it, unless he's more flexible about living in the UK 
I can see him picking up on it. He looks sad when I mention I slept fine back in the UK and when I call the UK "home." I've told him I miss home, but not to the extent.
We don't have kids, a mortgage or anything, for context