I think it's worth bearing in mind that Jeff was like 22 at the time he caught Kathy texting Phil in front of him and kicked her out.
@ReentryPhantom can correct me if I'm wrong but if I remember Jeff was 18 and Kathy was 23 when they started dating.
Just something to keep in mind when speculating on their relationship.
Like in the 'Hair Tricks' videos I think Jeff was like 19 or 20 at the time. Not sure if I'm remembering this right but I think Jeff had a decent job as a car mechanic or something as well and also covered the housing bills for both of them.
He was certainly able to kick her out of his house at the drop of a hat, and there is also 15 month gap in her employment history from April 2014 to July 2015 during uring a time they were together.
I also find it kind of interesting that it seems she had to pick up a 2nd job at GameStop at the end of 2017 to make ends meet having to support herself. It says she was just hired as Holiday Seasonal help, usually if you aren't fucking useless it's not hard to get a place to keep you on. So it wasn't just the place she had been renting month-to-month not offering the lease to her for February 2018, it was also because she had lost her 2nd job at the start of January. Just interesting how Phil leaves out the part that would imply he has offered to take care of her financially but shares the part about her living in a month-to-month leased flophouse.