I’ve just read your husband’s text.
It’s tactical.
Even if every word is true - which, technically, it might be - he is leveraging the ‘truth’ to keep you right where he wants you to be.
He’s weaponising transparency.
Right now, he has the best of both worlds. He can maintain (quite a delicious) relationship with this woman, with no disruption to his own life.
Wife, kids, home...with a ‘tendresse’ on the side.
But, oh - it’s not that! They’re just ‘friends’!
That he wants you and her to be friends is particularly revolting.
He is wrong-footing you in such a gentle way that you aren’t seeing this for what it is.
Stop feeling obliged to give him the benefit of the doubt. You have been more than fair.
This situation is not going to go away. Over the years, it will take its toll - on you.
You say that you still love him, and you don’t want to leave.
Please at least consider that, at present, you may be too close to the situation to be viewing it objectively.
I hope that, in time, you will at least consider that it might be what I suspect it is - a slow form of emotional abuse. Gaslighting writ large.
Trust yourself, OP. Trust your own judgment and your gut.