<human>: Hey guys, excuse me if this comes across as me venting but i'm fed up to the brim with the constant fighting and jealousy games my girlfriend plays on me. 

Here's a quick background on our relationship: 

I am 21 years old, work two jobs and for the most part I am independent. I have never been the jealous type until I met my current girlfriend (lets say her name is Courtney.)
 Courtney is 19 years old and still highly dependent on her parents. Although, in my eyes, she is beautiful, funny, sweet and affectionate, she stoops down to levels of inexcusable immaturity that blows my mind. 

She often goes out with her friends in which I despise with a burning passion for various reasons, i.e blacking out drunk, cheating on their boyfriends, getting kicked out of clubs etc.. 
When the girls get together its like fire and gasoline, they hit the bars, get blacked out drunk and often drive.
 But here's the thing, if i were to EVER go to the bars with my buddies, or even talk to my friends about other girls, Courtney immediately assumes I want to cheat on her and jumps to things like "Maybe we should see other people" or "Ok well i'm gonna go out and get drunk with my friends too, have fun lol." And this drives me bonkers. 

I've tried to link Courtney's responses to insecurities and the rough past she's lived, but even then I can't justify her actions. 

Its gotten to the point where almost every day she is trying to catch me in a lie by checking my text messages, my facebook, my contacts etc.. 

I have never cheated on her, but with the recent turn of events I find myself losing feelings and have developed the urge to pursue someone else. 

So I was hoping, with your guys' help, I can reach a conclusion. Do I tough it out and hope for her to change or do I leave her and pursue something new. The thought of freedom and being single makes me happy, but the thought of leaving her makes me feel lonely and unmotivated.

Give me a shortened version of the text
<bot>: My girlfriend of 18 months, who I deeply love, constantly plays jealousy games with me and hangs out with people I do not approve of... what do I do?