How to divide finances when living together and he has children?

I joined fluther based on the answers you all generously gave to a woman whose bf was wanting a den in exchange for her to do more housework. (No, I’m not being accurate but just some words to jog memory). Anyway, my bf wants me to move in soon. He has 2 beautiful kids who stay over every other weekend (Fri-Sun). He is not wealthy but not poor. He said that when we live together we can do many more things since we will be both saving money. (Yes, he takes me out and treats me very well and respectfully). My friends says that I shouldn’t be expected to pay half the rent but maybe offer to pay all the utilities since he will be making more than I will. He knows that I will not be a “roommate” forever. (We have been dating 7 months-he’s 51 and I’m 47). Marriage in the future is not a question. (If it becomes one then I’m outta there). I just don’t want to feel like I am inadvertently helping him to save for his kids college fund. He is taking me west to meet his mother and sister (with the kids) and paying for it. I’m just asking for some guidance. When I was married, it was easy and even living together with my ex… no issues with money.