When pervasive resentment enters the mix in a relationship, it’s pointless asking whether it’s reasonable or unreasonable. It just is. And it won’t go away even if everyone tells you that it’s unreasonable.
You can no more change it than you can force yourself to be attracted to someone. (And once it’s there, it will destroy sexual attraction - as I think you have found out.)
Personally I don’t think most women are attracted to men who come across as weaker than them- at least not when they have children. (You don’t need another child.) This is a stage in life at which the ‘strong protector’ figure is most attractive, and the weaker seeming man a massive turn off.
The male lower earner in a relationship is not necessarily the weaker party - but the way you are describing your partner does not make it sound as though he has any of the other characteristics that would make him appear strong despite his lower income. (You make him sound a bit wet- which of course may not be true at all, but the point is that this view of him is what leaking out from you, which is what matters.)
If you accept this resentment is here to stay, what can you do?
You can leave him. You’ll need legal advice!
You can stay with him and try to suck it up. Swallow the resentment! If you do this, there is a high likelihood though that you’ll have an affair- because it’s absolutely natural to long for what is missing in your relationship- and you may well be working with men who do come across as ‘stronger’ and more dominant. This could get very messy. (I say this because I am oldish now and have seen this happen….quite a lot. People can only suppress so much.)
I can’t think of a third option!
I’m sorry to be negative. But I think the pattern you are describing is a familiar sad one. I don’t think men realise the negative consequences for their relationships of taking a back seat to their wives in career & financial terms - the way it kills respect and sexual attraction.
I really do not think the man doing the laundry while his wife pays 75% of the bills gets women’s hearts beating, I’m afraid.