<human>: There has been a few fights and what not but for the most part everything has been good. This is my first serious relationship since graduating college and having a real job. For her, she just got out of a LTR (was actually engaged before finding out her to be was cheating lol).

So the meat and potatoes. She has gotten really comfortable with us... And I think its too a fault. Its like she doesn't really try anymore, just goes through the motions, only have sex when she's horny, has no problem asking me for large favors (borrow $100, borrow my sports car for a week when her car broke down, take ger out to eat/drink too often etc). She does all this under the pretense that "I'm going to be a big part of your life from now on, so lets take kid wheels off". 

And there's other things too... Like she gets off work at 9pm... Goes out drinking with her co-workers and text me at 3am to let me know she's home. When.i show discomfort towards such action, she acts shocked and appalled. "Omg you don't trust me?? I'd never cheat on you, you don't have to worry about what I'm out doing because we're I'm a serious relationship..."

Huh? I'm having a hard time getting my head around this kinda of stuff. Once again, I'm a noobie when it comes to serious LTRs. Am I overreacting? I'm really invested in this; emotionally, financially, etc. I don't want to push her away by being insecure, but shittttt.....

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: New GF way too.comfortable way too fast, not trying near as much as before, slightly taking advantage, not putting out, etc.