I love my bf

a lot and I see a lot of potential in our future like getting married and moving in together... well he says we aren't ready and i agree, it takes a lot of love, dedication and time to get to mariage. but lately he says I've been doing things ....but accidentally and he says he's going to do it to me so I can see how it feels when I do it to him... I told him we are never going to get any further in our relationship if we're going back and forth all the time like that... i just need to know what I can do to make this a little more mature for us, we are both 21 so we are young or relationship is just so immature.