Hey, anytime you wana get some stuff out, go right ahead! Messageboards are good for that!
Im sure things will get better. How is your mum?
Tell your ex you don't want any contact? Tell her you love her but you dont need to hear from her constantly that she doesnt want you and she doesn't sound like a very nice person by her messages. If she still loves you, then she's fooling herself with this new guy, otherwise she's just trying to mess with your head - don't let her!
The new girl you met, sounds like she likes you, keep it going i guess!
Sounds like you're going through a lot though at the moment, but you can get through it all and you will not be depressed and lonely for the rest of your life. Everyone gets depressed sometimes, and you will get happier!