Jodyray, I think he does need meds quite urgently - without them he is allowing his depressive thought patterns and behaviours to rule ie he thinks that what he feels is right and is unwilling to question it.
Depressives are notoriously unable to think of anyone but themselves and have no headspace for how anyone else is feeling. You could stand in front of him crying your eyes out and he would probably be quite unmoved and unable to comfort you.
I am and at the way you are being treated. You are bearing the full force of his illness and he is unable/unwilling to take responsibility for it.
How his ex treated him is again, nothing to do with you. His problems are not your problems but you need help to challenge him I think. What other support systems do you have? Friends, family? Or even a helpline.
When he says "He will see how things go" it simply means that he is abdicating responsibility and hoping that something will happen to make him feel better. Until he is willing to take a proactive step you will be left in this miserable situation and that's not acceptable.
FWIW this is what I would do. NOT saying that this would suit you but I know that in this situation its hard to think clearly, and it may give you some ideas. Be prepared to be met with resistance though, depression makes people put up very thick walls.
1)Tell him you are not prepared to put up with the "limbo" any more. It isnt good for you, him or your DC's. Life is too short and you need some degree of commitment.
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State that you are sure that he is capable of being the partner and parent that you and DC's need but obviously needs help. Make sure he understands that your ideal outcome is that he stays, not leaves.
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Tell him you are not prepared to take such a drastic step as selling your house when he cant even give any assurances that he wants to be with you.
4)Ask him if he would like to be happy. Few people would answer "No" Tell him that ITS HIS CHOICE to be happy, and all he has to do is make that choice, and you can take it from there re seeking counselling and meds.
You are NOT his counsellor, mother, crutch, enabler. You are his partner and deserve to be treated as such. This is a lot to take in, I know, but I hope at least some of it is helpful in allowing you decide what you want to do.