why else would anyone apply for a job
Because they need money to live on, doing something they enjoy and are good at. You are applying for jobs that play to your weaknesses. We could all do that, be unsuccessful, and then blame the weakness, but we could also all apply for jobs that play to our strengths, and be happy.
What would you like to do for a living? What sort of job do you think you would excel at?
is DH being mean? It seems like yes he is, but it’s my fault
OK. If you think you actually have the power to make him behave in particular ways, use it. Make him treat you the way you want. You'll soon discover that you have very little power in this area, and what you're doing is acting like it's your fault it's raining. There's very little you can do about his attitude, or about the rain. All you can do is get yourself somewhere where it doesn't bother you, or protect yourself better. Stop trying to deduce him, and deduce you. Why are you feeling that you are meant to/have the power to control another person's actions? Where does that come from? It's almost certainly your upbringing. We usually learn that putting up with behaviour that makes us feel rubbish, and then being blamed for it, is what we're 'supposed' to do, as children. But there is no 'supposed to', and as an adult, if something feels shitty to you, you distance yourself from it. Take responsibility. You feel shitty around him, but he isn't 'making you' feel like that, because he doesn't have the power to make people feel or do things, any more than you do.
You are seeing yourself as victim to the employment world, and victim of your partner's behaviour, but you are neither. You are not trapped, and you can find a way to find a job and leave him, but whilst you spend your time hoping to work out why he's horrible, and hoping that he'll start to be nicer, those minutes pass by, and you have made no progress for yourself.