There are a lot of odd assumptions from various people here. I don’t have the answer, but I am living a similar situation myself right now, so I can add some information.
First: yes lawyer consultations are free and easy to get (I’ve had several). However, you’ll receive limited answers from the lawyer. They will answer questions on what the law says, but they won’t give you any advice on what to do in order to get or prevent X,Y, or Z. In order to get you advise you need to hire them and become their client. And remember; you don’t know that your spouse didn’t receive their own free consultation from this same lawyer the day before. They are great when you don’t understand the system or the law, and also for determining whether you want to hire this particular lawyer (which you’ll probably want to do eventually). But the free consult is unlikely to completely solve your situation.
Second a couple that separates and doesn’t terminate or stop using joint accounts is odd to me. A lot of separations are over money, or if not then money quickly becomes very important. The first thing I did was open my own bank account. Who’s income is who’s is usually pretty clear.
So in our case, we are both on title of the “family” home, but she decided to leave and rent her own place. She signed over occupation of the house to me… basically meaning I get to live here, she has no right to come in and out and take stuff. It’s my place to live, but yes she’s still on title. When we originally signed the mortgage agreement, we committed to the bank that we were both responsible to pay the mortgage. Our later separating doesn’t change that the bank gets their money from one, the other, or both of us.
From there it’s not completely straight forward. She basically decided to sign an agreement to pay for a joint asset, then walked away from that agreement and payed nothing towards it. If I want to prevent the bank from taking the house, I have to pay 100% of the mortgage. In my mind if you want to forfeit on your payments, fine. Let the other person decide if they want to try and cover it themselves. But don’t expect to reap the reward of their paying the joint debt off years later and then coming back for “your cut” of the other person’s decades-long investment.
I told my lawyer that’s she’s responsible for and should be paying half the mortgage. I’ll cover all the utilities etc because I live there. Complication: Where I am there’s a term (can’t remember it off the top of my head) where when one co-owner no longer lives in a house, they can apply for (if they meet certain conditions) something which basically means I need to pay her out for her half of the house she no longer uses because in theory I could be renting it out and making money (a ridiculous assumption that you can actually rent out half a house to another family who can only use the bedrooms every other week when my children come live with me). But, legal I guess. That theoretical rental income I’m getting would essentially cover her half of the mortgage payments. So fine, she doesn’t have to pay her half every month; I’m paying her out every mortgage payment.
But, the question then is later when the house is sold, is she still entitled to 50% of the proceeds? It seems to me that I’ll have already paid her out monthly for her share. Say I paid off a $300,000 mortgage over the years by myself. Her mortgage payments got covered by me over that time span. Why should she then get half the final proceeds which she A) didn’t contribute anything towards, and B) has already been paid out? To me that’s clear-cut double dipping. I’d be forced to pay the bank $300,000 + her $150,000 = $450,000… for a house that’s only worth $300,000 in the first place. So if it worked out that way I’d have to pay a $150,000 penalty for taking over a joint debt; she’d get her half, plus be given my half and unjustly rewarded for deciding to walk away from her legal obligation to the bank.
I think the OP is wondering about a situation like that. And sadly I can’t get an answer out of my lawyer. Too many “it depends” clauses.