Miscommunication is a big factor in infidelity. Being absentminded and/or physically absent for periods of time can also be a major factor. There are many factors. It all comes down to not being appreciated and loved in a way that we should be. It comes down to not respecting the space between the people in the relationship and all that encompasses that space. When that space is threatened, even by you yourself, it’s still yours. It’s still a comfort so it may not be something that you’re willing to leave.