What do I say to these girls?

So I think I finally found the girl I want to be with. Me and her weren’t exclusive because we were getting to know each other. She even said so herself. And now that I got to really know her, I know she’s the one I want. In the meantime, I have four other girls who are into me. Two of which are barely getting to know me. And the other two are talking about hopes and dreams of us being together. I honestly think one of them just likes me for my looks. Because I barely got to know her, and she started mentioning how handsome I am. And talked about marriage when I’m barely got to know her (So she’s confusing love with lust). But I seriously am just sorry to have made these two other girls fall for me. Because I feel guilty that they like me. But I don’t know what to say to them in order to not break their hearts. I don’t want to ghost them, but it’s sounding like the best option so far. I’m just so ashamed of myself because I know I’m gonna hurt their feelings when I mentioned that I have someone I love.

What do I say to these girls?
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