@Tornonafriday i've read all your posts and you've got lots of words like "implied", "mentioned", etc. when you talk about what your DP has said to you regarding your job hunting. These words are red flags. They show that you and him haven't actually had a conversation with outcomes that can be applied to the real world.
You've had "chats", and, when you put his recent behaviour into the mix as well, honestly it sounds like you've probably heard what you want to hear.
The thing is, you've sort of tested this out already, haven't you? And he's shown you quite clearly how he feels. You assumed he would support you in the job you were offered - and you were wrong. You assumed he supported you in job hunting - and you were wrong.
What else does he need to do, to make it clear to you that he's not fussed about you working? I feel like he's made it very clear but you aren't wanting to listen.
Is there a possibility that you already know this, which is why you have been avoiding having a direct conversation with him? You've possibly been skirting around having it out with him because you'd like to maintain the illusion that he's actually supportive of you. Just think about that, you need to get reality straight in your mind tbh. Your partner doesn't want you to have a better job, he wants you in the job you have.
Also please please don't talk about how you're practically his wife. You absolutely aren't. Again, I feel like there's some avoidance of reality on your part in play here.