The question is, do you WANT to sort out the relationship? If you want it to work, talk to her and discuss the issues (not emotions, just whats bothering you, im sure you could tell us so you could easily tell her that..), if you do NOT want it to last, end it ASAP in any way shape or form.

Why is it wasted? You must have MANY good memories of good times, from childhood, teen years, then in your 20s, think of the good times.. Write about them if it helps..

Its hard to offer advice if we don't know much about your current relationship/friends/career etc..

There are ways to fix the problem of no attention or interest, but cross that bridge if you turn single! If NOT, then focus on your relationship and make it work..