Why does he still want me to go to school if I make good money?

I get military disability and I do tattoos. Most of my money is tattoos and I do a good job so from tattoos I get paid like $7-12k a month on top of the military is like $12-16k a month. I was in school but I dropped out to focus on tattoos and it's something I love to do. So my boyfriend wanted me to stay in school to get my degree. I was going for psychology but I don't feel the need for it anymore, he said I'll make more money than what I'm doing. Also I've saved up some money so I'm interested in investing in real estate soon.

Why does he still want me to go to school if I make good money?
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