Most people cannot handle 100% monogamous relationships, in terms of giving and receiving.

All people have a certain level of needs that they must reach in order to feel fulfilled in their life.

Some people need to play a certain amount of video games to be happy, or do a certain amount of shopping, or have a certain sex drive.

If your significant other has to fuck Jesse the first Friday of each month in order to entertain their wild side then you should let that happen. It's fundamentally no different than allowing your partner to go binge on video games or shopping every now and then.

It's better to be your ideal partner's 90% than your substandard partner's 100%.