Online dating guy stalks than disappears?

So I was on a dating app and matched with this person and they asked if they could see my insta and if I had pictures of me on Insta. So I gave them my username and they messaged me on there like dang you’re gorgeous and then I was like chatting with them on insta and they’re like what’s your snap and then they added me on there and we’re like chatting about our hobbies and then they ask like what you looking for friends, relationship, something else and I’m thinking we matched on a dating app so what do they mean? I messaged I was looking for relationship (not with them but in the app) and messaged what are you looking for and they disappeared and unfriended me on Snapchat. So what is the purpose of a dating app if it’s not for dating? It’s not a main stream app either.
Online dating guy stalks than disappears?
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