I don’t understand

I really don’t know if I’m wrong or just to young to understand as he says but I’m just so confused we’ve been talking for some months now we met almost a year ago he’s met all my family spent holidays with my family text my mom & invite her for dinner with us be around my kids wants me to come over everyday we’re not dating but he says he wants to.. we started arguing because he told me he wasn’t talking to anyone else & then I found out otherwise & he basically said he’s not going to stop talking to other people because he doesn’t know where this is going & he wants to keep his options open I said it’s fine I just don’t want my kids or myself really building a bond with you while you are building with other people like we might as well just be hooking up then lol & I just feel like he’s telling me so many different things like how can “you are the only one I’m building anything with” & “I want to keep my options open” both be true? Is that how being in “the dating pool” works? I’m so confused I’m 23 & been with my kids dad who since I was 15 so I don’t think I’ve ever really been in “the dating pool” I don’t understand how to get to know more than one person at a time.. it feels wrong to me?