<human>: Summarize the given text in a few sentences.

Six weeks ago, after four years the relationship between me and Karen (fake name) ended. 

Long story short, I ended the relationship after feeling neglected for months, after I did plenty of effort to change things.
We work together, own a business together, so we're still in constant contact.  Having broken up makes it easier to talk about certain things (the business, our past), but makes it very hard to get over her.

I stopped myself earlier from trying to get in her facebook profile to check who she's talking with, I fear she's already lining up a next boyfriend.  At the business she's constantly chatting while her main work is finished.  She takes care to close her chat windows when I pass by, and always closes her facebook when she's away from her laptop.

I realize it's none of my business who she's talking with, and that's why I'm here.
I need help, advice, a friendly ear perhaps. 

Full disclosure: One of the main reasons why I broke up with her, is because I read a chat of hers on facebook where she was badmouthing me.  Calling me lazy, inventing stories that put me in a bad daylight. She met with a facebook friend of hers behind my back, after which I demanded to read the log, because I wanted to know what was going on.
<bot>: I'm jealous of the people my ex talks with.  I need closure from this relationship, so I can continue with my life.