Is he gonna be scared away?

So i've been hooking up with this kid for a few months. I really like him. He's a big player so I've tried as hard as possible to not have him think I care too much. So i'm never the one to contact him first or anything. Anyways, I saw his older sister at a party last weekend and we were talking about him and she was like I wantt you guys to be together, i told him not to ever hurt you or something along those lines. So the kid and I talked on the phone the other night and somehow we got in the convo of his sister and he was like "my sister loves you she always says she wants us to date!" and for some STUPID reason it just came out of nowhere.. i was like yeeea she said we were gonna get married! and i really have no idea why i said it and he was just like haha i mean i like her enthusiasm but i dont know if it would go that far. But im just so humiliated. I have no idea why i said it, i have never even thought of marrying him haha it sounds so ridiculous even talking about it but basically im so scared hes gonna confront his sister and shes gonna be like i never said that! I sware im litterly not crazy, it just came out of left field. But i mean we talked for a while still. And hes talked to me since the convo but I really know hes gonna talk to her. Whats the worst case scenario here? I cannot stop playing it over in my head.