Answering the question:
"Is it ok to love two women at the same time?"
To become a professional musician, you need to have a wide repertoire, face new challenges, overcome previous limitations and make your brain work over and over again. The same applies to the art of love.
If you only play one piece for a few years, even if you do it very well (you're a serial monogamist or a lazy person), you have no skill to love at all.
But if your repertoire is varied, it’s constantly expanding, and you can also improvise on your instrument (flirting outside of your relationships/“repertoire”), then you can call yourself a love pro.