If your child is an adult (18+), then no, you should not be making most decisions for your child. Certainly not about dating. Your child should be learning how to be independent, and managing their own time, and parents need to learn how to start backing off, so to speak.
Footing the college bill doesn't mean you get a say in who they want to go on dates with or that they need to stop playing video games so much, but you can work out deals, like if you pay tuition, they need to be working a part time job/volunteering/getting internship experience. If they are still living at home, then yeah, there are house rules that should be followed. They should contribute to the house cleaning, preparation of meals, etc. They could pay for their own necessities (like clothes, shampoo, gas, etc). If they don't like it, they can move out, after all. Of course, if they are failing all their classes and are being lazy students, at that point, maybe you need to have a serious talk: something like, I'm only going to pay tuition if you get at least a B average or something, and if you're not in college, you're working full time.
But all in all, you have to let them learn how to be an adult, so you should not micromanage their life.