OP, I’m late to the thread but just wanted to reinforce the chorus, as I know it’s sometimes useful to hear the same thing in different ways.
As you have said, depression is not an excuse or explanation. It takes a certain kind of character to be capable of abusive behaviour, and that character is never safe to be with. If it’s not depression it might be substance abuse. If it’s not substance abuse, it’s childhood trauma. I’d it’s not childhood trauma it’s ’trust issues due to a past relationship’… Abusive characters always have a reason that they are the victim and not responsible for their behaviour. They also all have a narrative for why it will be different next time. In your case, it’s the hope that they will recover from depression. They also ALL have created a memory of ‘better times’ that keep their victim waiting desperately hoping for a ‘return’. Most of them offer ‘moments of sunlight’ amid the abuse, to make sure your memory of the good times stays fresh…..And they ALL have a devastating impact on their victim’s self esteem, making it hard for that person to leave. I’m not saying it’s calculated, but it is absolutely the formula.
But in the end, you don’t need to understand who he is or know if it’s conscious or not, or make a judgement about him at all. Being in a relationship with him is bad for your wellbeing. You are not enjoying being in a relationship with him. And that has been going on for a long time now. Those are perfect reasons to break up. You don’t actually need any good reason to break up- you have every right to break up if you don’t like the shape of his moustache or you just changed your mind and fancy being single!) You don’t need anybody’s permission. You are a good person and your duty is to you and your DD. My DD was 6 when her dad moved out. She doesn’t remember that time, whereas she has fairly clear memories starting age 7 and 8. The sooner you do this, the better for your DD.
And one last thought. You are asking about building your self esteem before leaving. It is very hard to do it because he will continue to erode it (as he did last night). You will probably never feel stronger with him than you do right now. You will likely feel an instant boost in your esteem, however, when you end things, along with a rush of relief and sense of freedom. My guess is that because you don’t live together and the abuse has not been going on for multiple years, you will not be so far damaged yet that being alone will feel terrifying. That’s what it was like for me. I was in an abusive relationship for 2-4 years, but we never lived together. (In that case it was alcoholism and apparent trauma I had unknowingly caused by doing something nobody else would have recognised as wrong). It felt impossible to leave for a long time, because it felt like betrayal. But when I did I felt unbelievable release of anxiety and it now boggles my mind that I stayed so long accepting awful treatment and crappy excuses.
You can’t wait to feel better about yourself to take action. It’s a bit like waiting to stop eating rancid food until your tummy is less upset.
I really hope you can act now to feel better.
Sending hugs.