First, you can use some things to test whether he is sincere to you, whether he is willing to spend real money to take him to buy something you like but expensive (it doesn't matter whether you buy it or not), and whether he is willing. Take him to eat something expensive if you like, same as above. . .
Second, the above is superficial. If it's over, let's see if he can accept your shortcomings. Deliberately show your shortcomings in front of him and do it several times to see if he will get tired of you (it is said that even his shortcomings are beautiful when you love someone);
Finally, if he pays a lot for you and doesn't respond to your shortcomings, tell him that he must meet his parents before the couple goes out and promise to get married in front of them.
If he wants to, there is nothing to say, it depends on whether you like him or not. . .