I think a big reason why people fell out of love is because they are not truly authentic with their highest values, carry some shame and guilt and are not self expressed with one another.. over time, this piles up and create separation. feeling sexy is also very important, and this can show up in different ways for different people, eg :having a toned body, having a carreer or being driven, having a great mindset etc. true authentic communication is key, yet most people dont even know what this mean. good article jonokala