Should I resign or not?

To clarify I'm not looking for someone to tell me what to do. I'm interested in peoples thoughts given my position.

The situation:
Me: I'm married, we're looking to start a family and currently don't have a house or car.
Work: I'm a co-founder of a SaaS company and my fellow co-founders have different view points that mine, which are rooted in a fundamental understanding of how people should be treated. I believe in investing in the work place environment and individuals; they do not. They wish to spend as little as possible and get as much as possible.

Now, the company has been going for a few years and has grown from 4 to 10 full time staff. However, my co-founders do not communicate with me and don't make me feel included at all. Now some of this comes down to the fact that I was, and to some extent still am, depressed. I'm a hell of a lot better than i was. I took 2 months off work to centre myself again and mend the relationship with my wife. We are both much much happier.

Since i've been back at work, little effort has been made toward me to bring me up to date on what's happened etc and the first week i was back i wasn't even told that the other co-founders were going on a business trip for meetings for most of the week - seems like a pretty reasonable thing to tell me.

My wife is terrified of the potential consequences of leaving but I feel like the risks of staying far outweigh any risk of the unknown. I'm currently on a massively sub-par salary (which I was ok with but now I'm starting a family it's not enough; this was in an effort to reduce costs to extend company runway (something else that I don't believe in but that's another discussion.) and another reason why I'm not receiving a reasonable salary is because we haven't hit revenue target and thus are not yet break-even.

Any questions or things you want me to clarify please ask, i'll update the question. Any advice/help would be greatly appreciated.

Disclaimer: This is my decision and as such no-one who answers would be ridiculed and sued or anything like that. I take on the responsibility that this is my decision and mine alone. I care about the opinions of people on this site and thus am in need these opinions and thoughts and perspectives i may have missed.

Update (Mark): I used to make all the sacrifices, 7 days a week, my phone never turning off, my salary and there won't be a significant return for 2-3 years.

Update (Milica):
Unfortunately I've been telling them and trying to fix it for well over a year. They won't change. I have had to chase them for information for a long time; they don't freely come to me with information like I do with them.