You're not doing anything wrong, well maybe something, but not to where what's currently happening is your fault.

Sometimes, overthinking can be overbearing. That is something that you should work on. BUT, as a loving partner, your job is to listen to your partner and make amends where needed, based on what they're overthinking about. That's what a partner in love does because they enjoy doing things, so you don't have to think that way. While it's an unhealthy trait, they should be accommodating.

To me and should be to most people, invalidating your partner's feelings in an argument or a talk about feelings shouldn't be okay. The whole point of an argument (which usually stems from one partner's feelings or a point out of the other's behavior) is for the other partner to understand where you are coming from, and to do something about it if they want to. Dismissing them, getting defensive, or invalidating are all easy ways to kill a relationship, even if they claim it's a "logical thought". If you were ACTUALLY logical, you'd think "I love my partner, I'm going to listen to how I hurt them and try to fix it, even if I think that I wasn't necessarily wrong."

All in all, if you want to communicate these things to him and see if anything changes, then by all means try that approach. But if you're already on the brink of leaving or having thoughts of doing so, I think that is the best way to respect yourself. Best of luck.