My boyfriend makes more money but is not paying his share of living expenses?

Recently my boyfriend moved in with me. We had agreed to split the bills 50/50 even though he makes 33% more money than me. However he shorted me these week on the rent after giving it to me late & I've been paying for all the meals for the entire week. I find it very disrespectful that he thinks his money and needs are above mine. He said that we would be helping each other and saving for our future. Instead I am starting to feel used and resentful. He doesn't even bring up the fact that we need groceries, and has been emptying my shelves of what I had stockpiled before he moved in. He drives a company vehicle and doesn't even have the high gasoline prices that I have to pay weekly. The fact that he would even consider burdening me by not paying his half has got me reconsidering his character. No he has no major debt and neither do I. I'm tired of him acting like he has no money and somehow I should. I am going to make him sit down with me if he doesn't contribute more equally soon and give me some answers. I would like some suggestions on how others have handled this situation. Alos, he made a few hints that my grown son who makes very little money, gives most of it to raise his child with his estranged girlfriend because they co-parent, and will be attending college soon should pay too. My boyfriend thinks that his young son should live with us for free however??? So essentially I should pay more than 50% even though he makes more than my son and I bring home combined? I already told him that was out of the question. He even has his own toothpaste since he hasn't been here that long but has been using mine instead. When I was buying groceries the other day he threw in some bodywash for himself and made me pay for that too even though he has some already. I would never pull a stunt like that. My son pays for all of his essentials. It all just seem so inconsiderate and opposite of how he presented himself to me. I'm afraid all these things are going to spoil my hope for the otherwise great relationship we have had and any future together.