Me and my girlfriend have been dating for 6 months, she texts me one day and admits to hanging out with another guy behind my back. She says they weren't having sex or anything, she was just using him for money, but he would always come pick her up from school and they would talk on the phone a lot after we got off the phone, they were also Sexting each other and they would hang out a lot. She says she didn't send any pics only he did. She says she's sorry but it's like I don't believe her but I want to. She promised that it wouldn't be anybody else and all of this was hidden. Should I just detach from her.

Yep, she was cheating, (I will assume you both agree not to date anyone else) and you were not flirting or hanging out with any girls

How do you know she's not using you too for something. If she did it with ANYONE else... she could and might do it with you too. Morals and ethics are involved here, or more like... lack thereof on her part.

Words mean nothing....they are cheap and easy to spit out.....actions have meaning....but that requires action over time. Something that there hasn't been any of yet.

Just the fact that she is using someone for money would be a deal breaker for me.

Forget about what you want to believe and deal with the facts and not just the feelings. Now that you know what she is capable of either you date and be more realistic, or you end it and find a better person to date. Either way only you can make the decision if she is worth it or not or even deserves your loyalty.

Just me, going behind my back and allowing a guy to sext, while she uses him for rides and money for her entertainment is a deal breaker. I wouldn't want to date such a person, as her loyalty and honesty to YOU was a lie. So BELIEVE what you want, you have enough FACTS to make a decision for yourself about this 6 month dating arrangement. Truth, honesty, and loyalty was not a part of it.

Use your brain, not your heart. Protect yourself, and your gullible heart.

Me and my girlfriend have been dating for 6 months, she texts me one day and admits to hanging out with another guy behind my back. She says they weren't having sex or anything, she was just using him for money, but he would always come pick her up from school and they would talk on the phone a lot after we got off the phone, they were also Sexting each other and they would hang out a lot. She says she didn't send any pics only he did. She says she's sorry but it's like I don't believe her but I want to. She promised that it wouldn't be anybody else and all of this was hidden. Should I just detach from her.

Short answer: Yes.

Long answer, if she is willing to play a person as easily as she did, what is stopping her from playing you? This is showing many bad character flaws that you don't want in a partner. It is hard to say what is going ot happen with her and you. This came out only after six months. It could get worse, a lot worse. It is best to cut your loses and move on.

Pick her up from school... high school? No one can expect fidelity when that young, sorry. Emotions change from moment to moment. Nature sort of plans it that way. You are supposed to 'hang out' and not get too serious, while you learn more about relationships. And guys are as fickle as girls.

What I am trying to say is to not get bitter (not saying you are). Turn your hurt to some other activity til the pain passes. At least she told you!