Hey guys, i need your advice here, please?

This one is about witches, i've met a guy about 3 months ago and he told one of my friends that one day he was so in love with a girl that he gaves her his soul in a session with a witch, is it possible? And if it is, what are the side effects? I don't know if he's lying and its very important for me to know, because i am dating with him, and he is always telling me that he isnt normal, and this kind of things