Guy is being too pushy for me and it’s STRESSING me out!

I’m going on dates with a guy (he is one of my girl friends brother). He tells me he never had a girlfriend before and he doesn’t know how this works so he’s ready to be in a relationship he told me. On the other hand I like him but I want to take things slow as I just got out of a bad relationship and am still healing and taking care of myself after that. I told him I want to take things slow but we were seeing each other once a week and now he told me he wants to see me more times throughout the week. I didn’t even wanna have the obligation of once a week let alone twice a week. I don’t know how to go about telling him he’s going way too fast for me right now and I feel as if he’s being pushy with making plans. I don’t want things to be awkward with my friend either seeing it’s her brother so how do I handle this?