Relationship may start from friends and may also not. From friends it is possible to go to the next level, anyway feelings may develop right? Having a relationship with the guy who has never been your friend might also happened. It really depends on how you want and handle it.
However in every relationship there is an end and it only means that your not meant to be. Being friends with your ex-boyfriends is not that bad as long as your both over with your past and just wanted to be friends.
Just like what Pauleen Luna wanted to be friends with her ex-boyfriends. According to Pauleen, her closest friend among her ex is JC de Vera.see related article.
I think theres nothing wrong with that but we don’t know what will people think unless your not after what they think.