Depression can be tricky sometimes. You get so used to it that you think you're at a normal state of mind. Check with your Doctor and tinker with meds; exercise; do some volunteer work. Helping others is a great way to feel good about what you're doing, and others benefit as well. Eat healthy and sleep 8 hours.
So after all the good advice, you can get through this. Find things to enjoy about being single before hooking up again. Being happy as you are increases the likelyhood of a positive relationship in the future. (oops - that was advice too)
Take care and PM me if you wish.