Why is it important to him that I “choose” him?

So I started talking to this guy recently I met on a dating app and we gel really well together, but I’ve noticed that he always asks me to “choose him”. When we were on the dating app, I asked him to talk elsewhere so that I could delete the app because I was interested in him. He started saying thank you for choosing him. That out of the other guys I was the one I gave my number too. Now that we’ve spent more time together he always asks me to choose him, I am assuming to be my boyfriend. My question is, is he really insecure or is this some kind of control manipulation tactic, where I pick him and he wants me to choose him and only him above everyone else? (family and friends) I ask this because I have been in a situation to that and was not good at recognizing it the first time, so I want to make sure this isn’t the same thing. I do like this guy and would happily date him but before I jump in, I want to be safe rather than sorry. Thanks in advance.

Why is it important to him that I “choose” him?
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