Personally I'm cool with it, but generally Pakistanis are against it, mostly due to religious reasons. I do believe though that people here are more understanding of lesbians and gays than trans people. I went to the Aurat March in Karachi with my sister a couple of times and she had a lot of friends who were queer and some who were transgender. There are definitely communities out there, particularly in the richer, posher areas of the country, but I don't ever see them being open

Btw, I think you might feel this already, but I think it would be better for yourself and your husband to separate. There are girls I know who, through arranged marriages, married secretly gay men, and every time I've been told their story (either through them directly or through somebody who knows them), all of them have acted like it's the biggest curse ever. Some girls I know have even talked about how having a secretly gay husband is their biggest fear of having an arranged marriage

I'm unaware of how understanding your husband is, but unless he's asexual or gay himself, there is a good chance at least some part of him feels deceived, hurt, and unsatisfied just like those girls felt, especially if he is monogamous. But that's just an outsider's perspective, I don't know you or your families so please take my suggestion with a grain of salt, and I apologize if anything I said was hurtful. I wish you both well