What you just described are the lessons from relationships, we all experience no matter how we get there. I don't know that dating allot necessarily fixes those lessons so much as how well you understand yourself and what you DON'T want. Notice I never said what you DO want. People generally want the same things in life when it comes to happiness. The things they do not want is usually where allot of people are wired completely different.

I didn't have allot of serious relationships when I dated, but I did date my wife for years until I understood what I felt I needed to know about myself and her. Ultimately did it prepare me for everything that has happened in over 25 years? Hell no. But the outlines are there. The parameters of who she is and her character are there. What I paid attention to or ignored are there too. Has she surprised me based on what I thought I knew? At times , but allot of that was for the better. Both of us have had to amend or evolve as we grew together and that's just the process. You can't score out of that with lots of dating. No one is the same person from 21 to 30 to 40 to 60. How well you understand yourself (and communicate that) plays a big role in how you handle each chapter of your life.

But I would also add, don't make emotional choices. Everyone has moments of frustration and even depression in relationships. So much can play into that too. Hell I found out my diet was making me depressed once. Really made me moody too. I henpecked my wife about everything and brownie points to her for tolerating it until we figured out what was stuck up my rear. The thing is, I didn't realize I was doing it. So when you wake up and suddenly start handing out failing grades to people around you, take a pause, gather yourself, and ask why you feel that way and if its warranted. Then start asking honest questions about everyone's role starting with yourself first. Don't cater to your emotions. Just step back and be objective as possible. Allot of times there's more in the mix than what we're just reacting to and you want to be able to sort everything out before you make any sweeping resolutions.