Is it normal to be perfectly happy with this relationship?

Hello there,

About a month ago. I was working very late on research, as well as drafting my thesis, and working part time. I often didn't get home until around midnight, and sometimes chose to stay in hotels instead because I like how the hotel showers feel. I came home one day and found out that my girlfriend of 2 years has been cheating on me with someone else. I was mildly annoyed at this, but figured it was reasonable as I was working late and couldn't be home to fuck her very often. Over the past few weeks, I've had sex with another woman from my college, and have been having sex with a woman from my surf club 4 times now. I am now balancing 2 women at once. Which can be inconvenient.

My girlfriend still thinks I don't know about her cheating, and she doesn't know about my "adventures" either. I'm perfectly happy with this arrangement, I get 2 women to fuck and she gets 2 men to fuck, so logically, it's flawless. But I don't know how to continue this without talking about it.

Is my situation normal?