I have similar problem like you, but I tried to separate with my bf but finally I go back to him again after 2 months. (I already with him for 8 yrs)
Don't give up. Find out the real problem between both of you. It's really difficult for both of you to leave the other side as you already together for so many yrs.
This is a challenge for both of you. Try to find out more memorable moment and retreat the wonderful memory with her. Girl is easily get touched by unforgetable memory.......