Does going for a new love really heal wounds from the past??? Why not focus and start on i...

Does going for a new love really heal wounds from the past??? Why not focus and start on improving and healing it yourself?? I mean those words really hurt Xkjdjdj IDK about it if that really works because I haven't really experience something like this. Does being an asshole cool?? Obvously no, seriously I really hate these kind of characters ,ashole characters who think that not being honest can justify their hurtful deeds and I didn't like how some famous mangas has these characters as their male lead and they even got a lot of praise. Why can't some characters consider the effect of their actions??!