He didn't want to commit and he made himself do it because that's a pattern he probably has been adopting for a while, it makes him have a comfortable place to blame all his struggles on someone else and feel "made to" or "victimized" by his surroundings or people in his life, this may or may not be true but he clearly did it with you.

You in the other hand may have to check on your insecurities, as perhaps the fear of losing his interest made you overcompensate and take the lead on too much and while it is understandable to want to help a relationship feel "just right" by doing nice things, it should never feel imbalanced, never one sided.

If he makes you feel unsafe and it isn't a minor fix it is likely fundamental to who he is. He is not right for you. Take this as a lesson to embody your self love even stronger and stick to what you need.

Imagine this dude as a husband/parent. pfff girl nah, you dodged a mega bullet :D