(NB: I wrote this in response to everything up to 22:27, and then went away from the window, so sorry if I xposted with later posts.)
Your post sounds like the kind of posts I used to make before I realised I was in an emotionally abusive relationship. I thought it was normal and I was just venting off a bit of steam.
"Now I'll be your favourite parent" while undermining you is nasty and childish. It's also fucking terrible parenting. If he disagreed with you, that's one thing, but to go against you because he wants to play favourites is ridiculous and manipulative. Red flag #1. I bet he parents like this often. Always doing the nice things. Going against you whenever it makes him look like the good guy/fun dad.
Yes okay, refusing more potatoes is possibly slightly odd, but from experience, when you're with somebody who is always parenting in this kind of haphazard way you tend to get pretty vehement in the opposite to make sure that (in this case) your child has SOME structure. There is no "pick your battles" because he's already undermining 90% of the battles, so you don't get to pick, you stick to your guns on all of them. Perhaps it wouldn't have mattered if he had potatoes, but also, it's not a totally outlandish thing to insist upon either. And with your later comments about plans for leftovers, actually, you didn't lie: There WERE none left available for eating that night.
BTW - I would perhaps give him the benefit of the doubt, thinking he might not have been aware of the leftovers plan and just felt your thing was unfair and then meant the comment as a joke, IF it wasn't for all the follow up. That shows quite clearly, to me, that he was looking for a reaction primarily so he could do that.
Stomping off on your part was childish, yep, but also not really a crime, plus, he was winding you up, meaning he got the reaction he wanted. Further reinforced by the fact, instead of either leaving you to get on with your strop, leaving the baby out of it, coming up concerned to see if you were okay, or waiting to discuss it later, he came up in order to taunt/berate you with the baby in his arms, almost seeming to enjoy the fact that he's using him to get to you. I mean, WTF? The appropriate answer to "Where's Mummy?" is "She's just a bit tired and having a lie down" or "She's feeling a bit cross with me" or "I don't know, let's see if we can find her" or "I'm not sure, but I'm sure she'll be back soon, let's go and finish dinner". It's not a natural, reassuring response to a child. It was meant for YOU. Not for him at all.
He doesn't sound depressed. Or, rather, he might well be depressed, but these actions aren't a result of depression. Depression doesn't make you into a nasty goady manipulative stonewalling person. It can make you withdraw, it can make you push people away, it can make you hide from your problems and yep it can make you appear like a not very nice person, but this is different, this isn't the accidental appearing like a dick that depression tends to cause, it's more of an actual concentrated effort to be dickish. What he's done today is actually straight off the wheel of power and control (attached)
Using children
- Making her feel guilty about the children
- Using [his conversation with] children to relay messages
Emotional abuse
- Putting her down (lazy)
- Calling her names (bitch)
- Playing mind games (parenting, following you)
- Humiliating her (even if "only" in front of your child)
- Making her feel guilty (no "parenting pass")
Minimizing, denying and blaming
- Making light of the [incident] and not taking her concerns about it seriously (ignoring, putting in headphones)
(If it doesn't come up big enough to read, click here:
stoprelationshipabuse.org/pdfs/PowerControlwheelNOSHADING.pdf)
What treatment/management is he having for his depression? Is he on any medication? If so, is that a new change? Has he spoken to the doctor about the problems within the relationship? Is it possible for him to move out while he works out treatment, in case he needs time to become more stable?