$5000/month is not chump change. The child is now 16. He was a stupid, horny young man when he impregnated this woman. And she must have been a willing victim.
The woman is asking him to buy the girl a car and pay for her college tuition. He's pointing out that he's been sending her bonus money for years. Money that could have bought her a good, reliable car plus been put toward tuition. Of course, he has deep pockets so he should pay more . . .
Now he's a stupid forty-two-year-old man!