Madison, you know what I bet you haven't thought of? Maybe in his new relationship, things aren't as 'perfect' as you might think they are. I've been in and know of relationships that are even lonelier than actually being alone- chances are, things aren't perfect in their relationship either, and the pain you feel from thinking that his life is so wonderful might be a total illusion on your part.
If you can, surround yourself with people who care about you, and allow them to nurture you right now- it's great that you've gone back to school, make new friends there- find time to go places and do things, things you always wanted to do and never were able to--stop and think about the things you wanted to do in your life, dreams that you had- and get out there and grab it! God will take this sorrow and pain you have now, and turn it into something beautiful, you watch--
"Trust in the Lord with all of your heart, and lean not unto your own understanding- acknowledge Him in all of your ways, and He will direct your path"