Here is a list of things that only couples living in a long-term relationship can understand. #5 is so true.
Your partner is the only person with whom you are comfortable enough to do that. Right?
You love to send selfies even if your partner is sitting just next to you. This is your best time pass.
You cannot forget to leave the house without giving her a good bye kiss.
You can actually spend hours deciding what you're going to have for dinner. The most common lines are: You Choose I am Okay with Everything. Hmm...Everything but Pizza/Cheese Roll/Italian/Chinese and so on.
The one who leaves the toilet last has to replace the toilet paper roll. This is a rule.
As a couple, you both enjoy eating each other's leftovers. That is completely fine.
You are each other's best audience and hence can't stop dancing stupidly together while cooking, cleaning, having a shower or anything.