How do you know when a person online is truly what they say they are?

I mean over the internet there are so red flags when a person meets online another one. Many perverts, scammers, sickos, sexual predators, murderers, among many other bad people out there. But Im sure there are a few who really are what they tell the other person they are. Even if the person lives in another city, still the person can be genuine.

How can you spot the real ones from the fake ones?

Are there signs even subtle ones that set them apart?

Im talking online with a guy for the past 2 weeks. He and I are the same age, according to what he told me. He seems real to me but Im just playing along just to start and check if I find something odd about him, that warns me "Ok this guy is a weirdo". So far I have not found anything. I had not met in person yet and I doubt I will meet him anytime soon anyway, he lives in anotehr city but we are just at this moment exchanging text messages, that is all, nothing more than text messaging so far.

How do you know when a person online is truly what they say they are?
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