and now I ask for help... Options

[pshaa.shauna]

Let's put this as short as I possibly can.

-met a boy
-fell in love. Seriously in love. Like when you have a boyfriend you see othe rguys and may think "Oh he's kinda cute" No. Every other guy repulsed me. I had no questions, I am in love with him.
-Went out.
_ For some strange reason that only fate knows, I broke up with him and went out with someone else.
-I break down everday and cry, even in front of people. No one has seen me cry before.
- Told him how I felt.
- He replied with "I'm not worth it"(as in he's isn't worth it, not me". Now, he is very smart, he's a freshman and taking pe cal, and has straight A+'s, he's like a prodigy, yet he calls himself stupid and other insults. He's doesn't think too fondly of himself.
-I tell him that he's worth it to me, and I'm pretty sure he doesn't beleive me.

How can I convince him, I didn't exspect him to believe me after what I did. This isn't some "Oh the other boy was an ass so I'm gonna lie to get my old boyfriend back." No. The next day, I woke up in a cold sweat, thinking that what I had done was a nightmare. I have been known to make dumb decisions.(To sya the least) I am convince I am going to be that old lady down the street that is cranky and grumpy because she's bitter and can't get over the mistake she made freshman year. So now I come to cb for help...

...what can I do to convince him???