Most Helpful Girl
you need to take a step back and take a few moments to yourself and think about everything. everything you've been through to get here and everything you still have to keep going. Are you going to deplete your life to one thing that happened or are you going to keep going to experience a better life. now that you have experienced this you have learnt from it and now you have to do everything in your power to never feel it again
Most Helpful Guy
You didn't make her the love of your life, you made her your obsession and you tried to make her your possession. You didn't have a healthy attitude towards her or the relationship and so the outcome was inevitable. Your jealousy infected both you and the relationship. You tried to control that which you can't control.
Now you think that life is over and want to give up? This is one girl in your life. This is one short period of your life. You made mistakes and things didn't work out. Learn from them and become a better person, then you will likely have better outcomes in the future. Don't start believing that this girl was the only girl out there who you will ever feel this strongly for, that is a crock. You will find love again and the next time you will do everything better. Pain after a breakup that you didn't want is inevitable. It doesn't last forever.