If you insist on casting towards this goal there are many spells in our site spellbook that will suit your purposes. I do however, urge you to get over this and move on with your life as she has obviously done. The reality is that it takes two people who are ready and willing to have a relationship, and this woman has indicated otherwise to you. She has reinforced this by maintaining the separation. You could perhaps overcome this for a brief period of time through magic, but ultimately there is nothing that can force this issue. The most likely outcome of casting is going to be to tie you even further to this, at a point it becomes an obsession, if it has not already. Seven years have gone by...it is time to take those photos and letters and burn them in the fire at Samhain. Let yourself let go of this, I know it is frightening. We often hold onto things, even heartbreak because when its gone it seems that it is truely lost...but the relationship is just that...truely lost. Look into the stages of grief, you are stuck in the denial phase, or perhaps the bargaining phase, hard to tell without further information and observance.
5 stages of grief : Denial, Anger, Bargaining, Depression and Acceptance