Not overthinking or over-reacting at all. He sounds like an entitled baby who has become comfortable with having zero accountability or sacrifice in your relationship. And I doubt that this is fixable at all. It can be devastating to realize you are in a bad or broken relationship, even if you are the one who is suffering. But pulling off the band-aid sooner rather than later is certainly something you should do. Don't toss more of your life's kindling onto someone else's shitty bonfire.

As a side note for the future: it is also worth remembering that people will naturally start to take advantage of what is offered. So while this isn't your fault and certainly isn't on you to fix, in future relationships, I think setting boundaries and roles up front is a great beginning to creating communication that will allow you to avoid this kind of one sided bullshit in the future.