Questions: Relationships

One thing I have noticed with women is they always like to talk they never shut up. About all that's happening with them who they are it's annoying sometimes. With this girl though it makes things harder because she never seems to have too much to say and just wants to listen to me. I have known her a year but since she never talks it's like we just met I hate it she's not emotional or anything I like her but I give up trying to open her up maybe she just doesn't like me but we have been seeing each other a while and I'm not really in the friendzone or her girlfriend. I feel like she wants to please so she doesn't say anything but it just makes things worse. Why does she do this? Is she just not into me.

Long story in short:

I held a party in my house when my parents went out (with my younger siblings). After the party, my best friend, or one of my best friends, a girl who grew up in the same town, stayed here to help me clean the mess and then to watch a movie. At some point, I began to hug her and hold her hands, etc. Finally, we had sex, quite good sex. That was the first time she had sex, although not my first time.

She then stayed here overnight, sleeping on the same bed with me. She told me she has been liked me for a while, and wants me to consider another possibility of our relationship. This just happened yesterday.

What should I do now? Please vote and give some advice for me. I really need them!

In my college I've already been labelled the 'rich kid' because i have a very big house and nice cars.
Do you get envious/jealous of rich kids like this? I can tell people have been jealous of me and i just blot them out of my head.
People think my lifes gonna be really easy, but i still need very good qualifications to take over my dads business and have to work hard.

this is how i met her she was a mutal friend and i met her at my friends birthday party, she had lovely dark hair and pale skin and bright blue eyes. She was absolutely stunning and we started talking and built i strong relationship with her...
By the time we were a holding each others hand calling each other boyfriend/girlfriend i realised that i really trusted her and felt like she was a very important person to me. The 3/4 years i was with her i honestly treated her like a princess we would spend a lot of time together, we never really fighted over much. Like i was so amazing to her, i would always tell her she is the most beautiful girl in the world, i would sing to her, buy her flowers if she was upset, i was so romantic and caring, i would massage and kiss her body/feet when stressed, and people honestly thought i was a really confident tall good looking ambitious young man with a good job and good career goals and respected by a lot of people.
As time went by she did become a little bit colder/ we would have sex less and so i asked one of my loyal childhood friends who had never met her properly to find out if she was being faithful.
I remember he wouldn't answer my calls one day and he came to my house and he told me that he found her near a park deep kissing another man he even took a picture of them sucking on a fuckin ice cream together if i didn't believe him :(. I was crushed when he said this, i felt like killing myself, i was so upset and hurt! I remember crying like a fucking baby and had my mate comfort me, how embarrasing! I invested so much love in this relationship! I feel humiliated and a loser!! The next day i arranged to see my girlfriend in alone and i tried my hardest to make her admit she was cheating, and she was acting shocked and delusional.

I was so angry and pissed off, and i called her a cheating whore and smacked her. It wasn't a brutal smack but it was hard, and she knew instantly what i