This is really long, but I'm in need of some good advice?? please!?!?!?

This is really long, but I'm in need of some great advice.??
I'm between a rock and a hard spot. I don't know what do do. Advice would be apperciated.?
This gets long, so here goes. I've like this girl since I was a kid. I'm 16 now. Long time right?.lol anyways. We've been great friends forever. Two years ago she began to date a good friend of mine. It hurt like crap. Me and him have never been close since. They broke up this past summer. Me and her got closer, and everything was going good. I realized that at least I had her as a friend, if nothing else. I am still clinging to the hope that maybe someday there will be something more. Ok to make a long story short things cooled down b/w me and her, and they began to get closer. I had heard that things were being said about me behind my back, so I did something stupid, and immature. I took his phone and read a text message from this girls mom. It was about me, and it said some things that weren't nice.( I was immature, not liked, not respected). Ok that hurt like a *****, so I kept it to myself, and waited till I cooled down a lil' bit to confront her about it.
10 minutes ago - 3 days left to answer.
Additional Details
5 minutes ago

I called her and asked her what this was, and she said she was conveying to him, what someone ( one of her daughter's friends) had said about me. I said ok, forgot about it and moved on. Fast forward a month. It's been eating at me ever since. I trusted this adult, I'd talk to her about everything. She was great. What I have a problem with was that even if she was only conveying a message, she still shouldn't have been talking about it. She should've said this doesnt involve me, so I'm gonna stay out of it.
Yesterday, I talked to the guy who recieved the text ( my x friend), and he has since told her. She is furious w/ me for bringing it back up, and doesnt think she has done anything wrong. I'm in need of some deep advice. I don't know what I should do . Just let it go? That's what I want to do, and that's what I'm gonna do, becuz thats the mature thing. But have I messed up to a point were I can't fix it?

this girls mom is living back in high school. i'm sorry but i really hate parents who get involved in their children's lives to that degree. it is innappropriate.

my advice is to just stay away. immature parents breed immature children, so what do you want with this family anyway?

At this moment, don't draw this issue out any longer. Let it go, cut it loose, whatever. It probably really did suck, I wish I could sympathize to your exact anger at the situation. But you got to let this go. The guy isn't your friend, and the girl got closer to him after some time. Not only that, you got that girl's mom sending your friend messages.

Rejection sucks, a lot, but you pretty much aren't welcome in that scenario. Don't force yourself into it, don't drag it out any longer, just let it go. You're only 16 and you'll find other girls, trust me on this. Do not let this one situation become the standard for your future relationships. Walk away, don't see it as swallowing your pride, but as being smart and mature enought to walk away with your head high.