There is a certain sector of attractive and seductive men and women in this world - they dress well, have fine features, are charismatic, good conversationalists, can flirt extremely easily. And they are like that with EVERYONE, not just people they're romantically interested in. They most likely have had multiple partners because they're so charming and good looking. They tend to have a wide social circle, perhaps have or had a few FwBs. They are also most likely narcissistic or borderline. They are good actors in life. They know exactly what to say to make you feel respected.

You are dating a prototype of this charming man/woman. He/she treats you like gold, makes you laugh, makes you feel cared for, and gives you the most wonderful sex and conversation you could have. They confide in you, you feel like you can trust them with your secrets. But you know they have many, many friends of the opposite sex and/or plates.

How would you know this person is genuinely interested in you? What are some signs they're not just working their charm on you, and that they actually care?