How to know if a girl truly loves you

I decided to be with a girl for a long time, but sometimes when I was busy with company work, she started to get bored because she didn't know what to do, and wanted to date someone else.

I am 36 years old, earning 30 million/month, living in a big city, renting an apartment and possibly buying one. In general, my career and economy are quite stable, but I still hesitate when thinking about getting married. If only my income was 100 million/month, I would not have to worry. What I fear most is how to know if my future wife loves me or money (in case my job is difficult or I can't stand the pressure and quit, of course I will change to another job so I'm not sure). I only want to date girls who are 30 years old or older than me, or one or two years older is fine, because they think more carefully and deeply about relationships, and I don't have a flirtatious nature.

But nowadays, almost all girls seem to have a good income and spend a lot on their appearance, so when I date, I suddenly think that if the relationship progresses well, will I be able to satisfy her? And if she takes care of her own finances without me, it will be difficult for me to have her completely. And if both she and I encounter difficulties, for example, will she overcome them together or find someone better?

Maybe people say I think too much but in reality I find marriage today too precarious. When we got married, we got married because of love but after marriage, conflicts appeared quickly and disappeared just as quickly. My friend said that because technology makes virtual life easier, people don't need real people as much as before. So I kept wondering and the girls started dating other people. When we got to know each other, it was also proof of my fear, for example, I decided to go long-term with a girl but on some Saturdays and Sundays when I was busy with work at the company, she started saying she was bored because she didn't know what to do and expressed her desire to break up and get married to someone else. I don't know how to stop worrying and boldly enter into marriage because I really want to be a father. I hope you guys can advise me. Thank you very much.

According to VNE