If you dont have kids and dont have property and neither of you want something from the other as far as a settlement, I think its pretty simple and you start at the courthouse by filing. There will be paperwork but you can find that online or your state probably has a government site that will even help you with the process and and the paperwork. But if that seems overwhelming and you both agree, you can hire a lawyer as a ....cant remember what they are called but may be called a mediator. Either way, the lawyer is there for paperwork and answering questions to you both and is not there to settle disputes, just with the process that you two agree with. It doesnt cost much
But I have to ask this, do you have a faith or either one of you religous in a sense that marriage is more than just a business contract with binding papers?
If so, I suggest you consider what you are about to to do.
From the outside it sounds like neither one of you are very committed to the other or to the ideal of marriage. I say that because the both of you allow people into personal space reserved for married couples and you do it through your phone. Contrary to what others do or tell you, its not solid ground to maintain a marriage.
You ask are these reasons valid, I cant answer that for sure. But I know that if I loved a person, and I missed them when I was not with them, and if I got good or bad news I would want to share that with them because they are my best friend, and I am attracted to them like no other over a course of time, and that even when they make me mad or hurt me, I feel like my life is better with them, and when they hurt, I hurt and when they are happy, im happy for them and with them....then the answer is no.