Is making out on the first date a bad idea if you want something long term?

Anonymous
I'm sure this could vary or maybe I'm overanalyzing a bit but I've had a few times where I have a date with a girl and well hit it off and have endless conversations that flow well throughout the date but if we make out, it hasn't really lasted or well just have 1-2 dates. There may be no correlation at all but it's something I've noticed.

The other day I had a date with this girl off okcupid. We hit it off pretty well and had a ton in common, she was very attractive and easy to talk to. Then at the end of the date we hold hands and I walk her out to her car before going to mine and we kissed but then it turned into heavy making out for 30 minutes. After I left, I didn't get a text saying thanks or had a good time and today I texted her and still haven't heard back.

I'm not gonna rule out that it's over because she could be busy. She just usually responded right away to my texts and might be pulling a 180.

Anyways to the point of the question, if you make out with a girl on the first date and it's someone you met online, are they most likely thinking you just wanna hook up with them and that's it?
Is making out on the first date a bad idea if you want something long term?
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