I managed to get a slight update on Alyssa.
After sending a message to her friend Lor, her sister Kristi, and her friend DC and getting nowhere, I decided to send one more to Lor. This time around however I managed to get a response:
hahahah hey bryan!
yeah sorry i didnt respond to the first one she said she didnt wanna talk to you still so what am i to do?
Shes living in Toronto now with her boyfriend and just working and living, she seems pretty happy!
I'll let her know you tried again and see what she says
I think its a shame that she wont talk to you for even a momment just to patch things up or whatever. but its up to her i suppose!
I will relay the message along!
Hope you're doing well 
-Lor
While it did bring me closer to an answer, and i'm glad to hear she's doing well and happy. I'm more dismayed that she doesn't want to talk to me, but not surprised. My ultimate goal is to at least try to get Alyssa to talk to me. Just to give me about 5 minutes of her time so that I may plead my case, explain and apologise to her.
I do still care about her, and just thinking about the times we were close gives me butterflies. I understand now that I can't have her to myself, and while its difficult for me to cope with, it's something that I can respect. However, I cannot be entirely without her. I cut that section off when I started seeing Sarah because of my emotional connection. Not wanting to be stretched thin between two people I shut the past out in the hopes of gaining a fulfilling future. What I discovered instead was that I thrive on her friendship. She was the one person with whom I could share every little minute detail of my life with. I could have wonderful conversations about everything and nothing. Even knowing that she wasn't mine, she made me happy.
Apparently however, i've fucked things up pretty bad, and the thought of not having her to speak with is, to say the least: gutwrenching.
I'm thinking that I may send Lor another message in a few days to see if Alyssa can at least give me a few minutes of time to hear me out before making any descisions.