If you consider your significant other as your best friend, then they will most likely support you in whatever you do, they always make you feel special, they always make time for you, they will always be there when you need them the most, but most of all, they love and accept you no matter what.
Unfortunately, there are downsides if you consider one another as friends despite being a couple. Some relationship experts say that there will always be disadvantages of every viewpoint, because there are no perfect relationships.