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After her diagnosis, I read SWOE and made some posts here. I got some great advice to not buy a house or have any more kids, and have done that, but I'm now 33 and honestly want to have more kids and want to buy a house, but I'm not sure I want to do it with her. So yeah, conflicted.
Get as much information as you can about what life would be like if you divorce and if you don't.
I think it's reasonable to assume things will
at least be as bad as they are now if you remain married, and could only get worse; they will not get better on their own.
I recall discussions here about BPD possibly lessening over time, as people get less emotional over time, or at least the emotional fluctuations get less severe. I don't know if that's true. There are plenty of stories here from older posters (post age 60 or so) of these problems continuing into old age, and then facing added complications of having to cope with health problems related to aging, on top of the BPD. So "toughing it out" in hopes of improvement over time is a bad bet.
It might be helpful to pay a local attorney for an hour consultation to understand how things would go if you do divorce, in terms of custody, child support, alimony, etc. Of course, things could get nasty and divorce is never pleasant, but at least then you'd be able to weigh your options better.
Do not fall for any "free consultation"... you get what you pay for, and legal advice is no different. If you find the attorney you're meeting with is pushing you to file, get an opinion from another.