It's not a huge mistake IMO. It is contrary to DB principles about keeping your cards close to your chest. Breaking down and being emotional is not attractive,so try to avoid further episodes. That being said emotions are all part of being human. Being human is good. Don't dwell on that.
Letting out emotions is liberating and is helpful for you. We are like emotional pressure cookers and pent up emotions do cause us to come under pressure. The key is to find the release valve to reduce the pressure. Look into ways you can release this pressure before exploding.
Job can correct me if I am wrong, but IMO sometimes being open and honest regardless of the aftermath can be useful. As long as it is not love proclamations or pleading to come back. Stating your miscontent with current situation instead of just supporting it in silence, widens their view of the M. It creats a doubt that you will always be available later. Plus it shows you value yourself. Most spouses may view this as pressure and bolt.
The fact that your H hasn't is good BUT it will take him time to assimilate this and fully contemplate his long-term reaction. His knee jerk reaction was in the right direction but take it slow to see if his actions continue that way.
Lastly reign in those expectations. Keep them low and slow. I am o, t. t trying to dishearten you. This is positive, but he is not committed yet.
Best wishes
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together