My boyfriend likes to eat me out too much

Me and my boyfriend have recently gotten together. We’ve dated prior to this and we decided to make it official. Well he likes to eat me out too much and I’m suspicious about it he likes it too much. He also likes eating my butt as well TOO MUCH. I think he fucks other girls because why does he find it so enjoyable. During our time apart I think he practiced on other girls if he did I’m done with him. We never had sex prior to this... It’s weird plus he’s always working and he can be doing more than just working he could be doing it to other girls. He is a good guy but good guys can turn out to be bad boys. I’m just scared that he might be doing it to others and he says he does it to make me happy but I don’t believe him I’m going to break up with him.