Alvin, he's your boyfriend. He is very possessive of everything that belongs to him. This possessiveness of his is not for everyone. His possessiveness is only for people who are his and very special to him. And only this time when he was dating you, his possessiveness came out. He really loves what is his now. But without realizing it, his love is more than love and maybe he is obsessed with you, and that can be very dangerous. To the point that he won't let another man's finger touch you.