Emma, I have being through what you are currently going through..

I ended up seperating from my partner, and we were apart for well over 12mths..
We have recently gotten back together (only as a gf/bf type relationship), but we have chosen, more so I have chosen, to not live together this time..

It took me alot to get used to being on my own, but after about 5mths, I felt fantastic!
I could do what I wanted, when I wanted & didn't need anyone's "permission", so to speak..
Being back in the relationship now, I can already feel the unhappiness starting to return..
He is so incredibly in love with me, yet I can't return the same feeling anymore..

Best of luck with your decision..