Imagine, jealousy, so strong that you ask your lover to quit the job they likes. Great.
It's not an indication of extreme jealousy, it's really normal. To most people it's PAINFUL knowing someone else is having sex with the person you love. It's probably even worse if it's multiple people nearly every day. Some people feel differently but they're in the minority. But Haruya wanted to stop working as a prostitute anyway so it doesn't really matter.
There's also the high risk of STIs with Haruya having so many different partners, and we know they exist in his manga's universe since they show condoms. Even if they use a condom every time, there would still be a small risk for Hitoe. It would also mean that if the two of them liked the idea of having sex with direct skin-to-skin contact or ejaculating inside, it would never be an option since Haruya would have a continuous risk of infection.
My heart dropped when he start crying...
the way i began to cry too-