It's not uncommon when we get older to become more 'set in our ways'. Entrenched would imply that you are going to do things your way and not change a single thing in your life or schedule for anything or anyone. I'm not sure this describes you, nor am I convinced that he's qualified to make this assessment. It's not uncommon for men to be paranoid, or distrustful of a woman who is strong willed or stubborn (if you'll excuse me for saying so, particularly in that age range where he may be from a period where women were not so self sufficient and more defendant on them).
"adjust to more what he wants" you to be? You've been dating 7 months and he wants to change you AND have you divulge you finances to him AND combine your monthly incomes? He can't be serious, and you can't be thinking this is right? Seven months is barely enough time to get to know someone, no less combine finances or be asked to change your way of life. Atonement? Atonement is a pretty loaded word....he's no judge, nor is he your god, why would you need to atone to him? Money is certainly/obviously an issue here. If you want to forget about him, think about how much of a bully he sounds like, and how eager he is to 'combine finances'/ You didn't work and come this far to have someone else reap the benefits of your finances. If he really cared about you, he would want to do whatever it took to make you feel comfortable. Prenups can be canceled, if lets say you were married for two years and felt it was no longer necessary. It's not about the prenup, the money, it's about you not doing what he wants you to do, when he wants you to do it.
I understand that it may have been nice to have someone to be with that showed you attention, and was sweet, but his ulterior motives bely that sweetness, and you have to protect yourself. If he's not willing to compromise with you and i he continues to feel the need to (in my opinion) subtly put you down, then you will be better off without him
I welcome your thoughts, let me know if you want to talk more