Is it normal that he feels threatened?

Ok so my family's pretty well off. My mums never had to work. My dad brings home somewhere around a 7 figure salary and has his own successful businesses too. We werent always that way- mh dads a self made man and earnt all his money th hard way so we dnt live an overly lavish lifestyle but are financially comfortable.

Me and mt boyfriend have been together for over 2 years and have set an engagement date. The problem is, hes constantly worried abt the financial differences. His parents dont work. He has college debts. And his family all stay in one house and dont have enough bedrooms for everyone. Basically- they have financial problems. He constantly worries about keeping me happy because of the money issue and thinks i need to make big changes. I have curbed my shopping addiction to try and adapt to the future lifestyle and have said i will be fine. He still worries about everything though- right up to the wedding issue as he cant afford a lavish wedding but my dad wants to give me one. He also doesnt want to take any money off my dad. I suggested borrowing some money off my dad for a house deposit instead of taking a loan and he refused point blank. We dont live together yet as we are waiting to be married first. My concern is, is he normal for not allowing any help from my dad? And is he right in his worries about me adapting and am i just making too small a deal out of something big? I personally have always thought that the main thing is we love each other- not our financial situation. Am i being too naiive? Im getting increasingly scared as the engagement date approaches. I just dont want to make promises i cant keep.