When you build up something via electronic messaging for a long period of time before you meet, it raises expectations. It feeds the fantasy.
So when you do eventually meet, and they are either disappointing or they don't like you, it's much worse because you have invested so much time and energy in it. It's deflating. Then you think where did I go wrong, it felt so great etc.
A pp said they had been on 40 dates since September. This is the right approach. Get a date in the diary and meet them, if they pass the phone call screen, see them in the flesh. If they aren't asking you out after the call, back off. Don't keep replying and feeding something that isn't progressing. Send a smiley face back once a day or something. You are worth more than feeding someone's ego and being a text buddy.
The phone screen would have told me if he was a genuine doctor. If I had then met him this would have been confirmed by seeing him in the flesh. People lie all the time online because they can. Men lie about their height, their looks, their everything. Men want to impress. And there are scammers too.
If you approach every interaction with the thought is this the one you are setting yourself up for pain.