Time and again, one encounters people sharing a tired old maxim that “monogamy is incredibly hard.” Just like any other piece of “common knowledge”, this one is half-right. Monogamy is extremely hard for people who are not monogamous. Just like passing for straight is for a gay person. Or pretending to be polyamorous to please somebody when it isn’t your thing.
For people who are monogamous not as a result of interiorizing societal dictates but because it is their own, genuine sexual preference, there is nothing complicated about it. Just the opposite, everything other than monogamy is incredibly hard while being monogamous is the only thing that comes naturally and easily.
So if you find monogamy “incredibly hard”, maybe you should look into what your true sexuality is like. Chances are, monogamy isn’t the problem. Rather, your efforts to adopt a sexual preference that doesn’t come naturally to you are causing you all this hardship.