HJP actually gives SDM a lot of space both physically and emotionally. In terms of blind love, I think both men are blind, as I don't see the appeal of SDM. I see the appeal of both NDS and HJP though.
Yeah that bedroom scene between NDS and HJP was wrong on both their parts. I'm not saying HJP doesn't have flaws, because he does, but they are easier to ignore.
It's been implied in the show that regardless of his money, health, and etc... he is not happy.
When HJP tells grandma how happy he is, she simply replies. Your unmarried in your 30's your not happy. This hits home.
Yeah ofc, both men have their flaws. But as I have told the other posters, because of the characterization of the writer of both Male Leads, the flaws of HJP become far easier to justify and ignore than NDS. And by the time the writer addresses fixing NDS characterization, it had become too late, there were too many people on HJP's side, and would thus root for him until the end of the series.
In the end, the character messed up her character arcs.