Very Complicated Friendship Thing Please Help?

So it all started out like this. I grew up with this girl Ami whenever i was a toddler because our dads were friends. We lost tough in first grade when I moved. In 6th grade I found her again. We became really close to one another. We dated each others brothers. Then whenever both relationships ended, we had a brief fling. We cut our palms and did the whole blood sisters thing at a park down from her grandmothers. Halfway through 6th grade I went to live with my mother. So we lost touch again. I went literally clinically insane without her. I moved from place to place, Eastern KY, Southern IN, Northern FL and finally moved back to the town we had shared as kids again in the 10th grade. We were instantly as close as we ever were. I ran away from home and moved in with her. I found out one day while living there that right before I moved in she had thought about trying to get together with me. She'd debated it for months and was pretty sure that she was going to ask me to be her girlfriend. That's when I moved in. After I had lived with her for about a year I ended up sleeping with her brother. We used a condom but I still got pregnant. I then miscarried and I told her about it. She cried with me over the loss and we decided he never needed to know. So he never found out. Then I realized why I was feeling awkward about living with her, having sex in our room, her having sex in our room... I still have feelings for her. Im pretty much over her brother, but he was my first true love. Sure Id get back with him in a heartbeat. But I love her. I really and Truly do. I moved out to keep the awkwardness away. I tried everything but I still couldn't get her out of my head. Here it is almost senior year, I haven't spoke to her in 6 and a half months but we are IMing tonight. Should I tell her how I feel? I want to keep her around obviously, but I don't know if it would hurt her more to find out now or later or what.... Please someone tell me what I should do!!! And by the way, if you post any anti-gay stuff on here, I will report you and I encourage everyone else to do the same!