With that being said, I believe it is a married person’s obligation to ensure one’s spouse’s needs needs are met to the best of their ability. A good partner will not only meet more basic needs, like safety and security, but also the higher needs, like feeling desired and connected to the other. These are important aspects of feeling loved, but it is possible to still love somebody and not meet those needs for them.
so basically, by explaining your "belief", what you're saying is that the person you betrayed didn't meet your needs so you had to get those needs met elsewhere. In the future, if your needs are not being met again, what's to stop you getting those needs met elsewhere again?
The point is, We. Are. Staying. Together. you say that with absolute certainty. Sorry to say - life isn't that certain, as the betrayed found out....
by the way Maslow's Hierarchy has been widely discredited for taking a heavily Western-centric and privileged view of human needs. To your very point, the Needs pyramid is constructed in such a way that you have to go up through each step in the pyramid before reaching self-actualisation. There are many cultures that doesn't value elements of the Hierarchy in the same way, nor place the same importance to them, hence someone in a different culture may not have all the security, creature comforts, love etc, yet they are able to self-actualise. Stating that humans can only self-actualise if they've met all the other stages is a privileged and arrogant view of humankind - but it lives on because Western culture is very arrogant.