well in a way it's understandable, no? he tried to forget his love for his brother so he more than like tried everything. dating anyone he could, fucking anyone he could, ignoring his brother, treating his brother badly, etc. so in that sense it does make sense as to why he'd be a playboy.
"i LoVe yoU sInCe ThE fIRst tImE wE mEt"
*grows up to be a playboy*