Be very clear and consise in your communication with him.

[b]He thinks I am just overreacting to a small situation and putting pressure on our relationship.

He says he's really changed and if I just would be mature about this we could work things out. I guess giving me the silent treatment for two days every time he imagines an offense is mature then. He went on for some time, basically blaming me for everything.

No mention of marriage counseling.
[/b]

Make sure you validate his points (changes, pressure) then point out his mind-reading and his behavior that causes you distresss (silent treatment and not addressing M counseling.)
He is very scared right now that you are leaving. Let him know exactly what your boundaries and needs are. Let him talk but don't let him project or mind-read for you. Don't let him bait you, make sure you have a plan for your triggers.
You can handle it.

Cheers

M22,H45,W45 S21/18D12
Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.