I'm depressed and unable to connect with people after my breakup

A girl and I were madly in love. We dated for over a year and were even talking about marriage and future plans together. She moved away for school, and we attempted a long distance relationship. We eventually broke up. It's been a year now, and I still haven't lost my feelings for her. I still love her the same way I did. I've suffered from depression ever since the breakup and have been unable to connect with anyone else. It's damaging me and my life.