Well, it depends on what sort of emotional bond is. If, like the poster above me said, it is a "lifelong friend" type of bond then no that wouldn't be cheating. However, if it's that you or the other person wants it to be more than just a friend type of bond then yes I would consider that more. When it comes to opposite sex friendships it's a very thin line from just being a friend to being something more, in my opinion. If it is just a friendly thing and it's been there all that time then your partner should understand that.