confused..

because I 'really' like him, and I definitely want to be in a relationship with him. and I don't want him to think that because we had sex before we finalized anything, now we don't have to ☹️ it's happened twice now, and our relationship hasn't changed much, honestly. but before it happens again, I kinda wanna be sure of his feelings towards me. I'm not sure of his intentions, and I just wanna know before I assume he's feeling the same. how do I go about this asking him his feelings/having this talk with him?