We are meeting again tomorrow but he's active on the dating app right now?

We have met about 3 times before, he says he really likes me and wants to see if we can start a relationship I however have my doubts, I have noticed he is online quite often on the dating app we met on (it is quite public, you can browse members even without signing up) This kinda concerns me and I feel upset/jealous. Am i overacting? Is this normal as we are not 'exclusive' yet?
We are meeting again tomorrow but he's active on the dating app right now?
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