<human>: Can you provide a brief rundown of the text in within 3 sentences?

Girlfriend invites over random guys/ex's/old flings to her apartment alone. 
Some who of course have intentions to "have some fun" if they get the chance and actively hit on her. 
She's assured me that she would never do that. 
I've snooped and seen she has rejected a few and other times she just ignores the comment.

Either way I've had a history of people cheating on me and feel like I can barely trust anyone and I told her this, that I don't like it that she invites guys over who know were in a relationship yet still flirt and hit on her.

I'm not sure what to do. 
I feel like maybe I can trust her but the past has shown me that it's a foolish idea to think nothing might be going on.

Example, tonight she invited this guy Chris to her house to help her organize things, help out around the house etc. 
It's now 11pm and he's still over there. 
I asked her if we could go to dinner tonight around 7 and no response then basically said she better stay home tonight because it's late already.

Am I wasting my time? 
I've spoke with her twice about this already and let her know it kills me inside and fills me with anxiety yet it doesn't seem to stop her actions one bit.

I don't want to restrict her but I really am getting torn up about this.
Enough to write about it and ask for help.

I really love this girl and wish I didn't have to break it off for this kind of stupid reason but I don't think I can get past these feelings that something may happen and she'll just cover it up and never tell me.

What the hell are my options? Any advice is appreciated.
<bot>: I'm paranoid my girlfriend will cheat on me because she invites random dudes over and they spend a lot of time alone together at her house.