Search Results: pregnant at 17

Been in a relationship 3 years, all of a sudden out of the blue, she wanted me gone, found out through various methods that she was interested in another guy, told someone that she wanted to hook up with him and everything but was scared of falling for him more, and lied to that friend of hers saying he was interested and, if she got pregnant he'd love them both.

She made me look like a real monster to all her friends and family, and after i caught her she fessed up, admitting she "didn't know" why she was doing what she did, and knows she crushed me.

she's been on and off on anxiety pills, and terrible birth control that has messed with her mental psyche, and admits that she thinks she just went mental over this some how.
I called her out on her bullshit, and now we're at a standstill.

She wants a second chance; should I give it to her; why?

Here's a little additional info so to have a fully unbiased opinion:

1. We started dating she was 17, I was 19, she's been with me since, and hasn't lived a regular young teenage girl/adult life because she moved in and I'm not the drinking / party kinda guy.
2. she's never cheated before.
3. She does have a tendency of loosing her marbles.
4. she's always been with me, and doesn't really go out much so I know she couldn't have done anything until very recently.
5. She works with this guy.
6. She lied to her friends and family saying really bad stuff about me to ease the pain of what she was doing on herself, and made me look like the bad guy to save face.
6. Even after all this, I am Angry, upset, betrayed and feel reduced to nothing; HOWEVER, I do still love her with all my heart and do want this to work.

I've made mistakes in the past, never quite like this, but I believe everyone f***s up once in their life. she's agreed to come clean to everyone about all the lies.

2nd chance?