Our expert says:
Allthese modern technologies make it much easier than before to make contact with people we have never actually met, and to feel as though we know them better than we actually do. Mothers can have various motivations, including sometimes a desire to see their son married. You may have a basis for thinking that you might like him in person, but only once you have met and spent considerable time together directly and in person, can you have a realistic idea of whether he's likeable, for you.
What you describe your brother-in-law doing isn't normal, and it isn't sick ( in the sense of being due to a sickness ), but it's a form of cheating on his wife and insulting towards you.
Who knows whether your sister knows about this sort of behaviour, which he may well have directed towards others before you. Only if you discuss it with her could you find out what she knows, wants to know, and how she feels about it. You could also deal with it directly to him, telling him you have no such interest in him, and that if he tries it again you will tell his wife.
And remember what it means for a guy to be "a real Casanova" - Casanova was loyal and faithful to no woman ; he liked to conquer them to make himself feel great
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