That seems like a development after 1985. For the longest time, Hal carried a torch for Carol Ferris. He did eventually move on to dating other women. I guess dating Guy's former girl friend, Kari Limbo (what a name), when Guy was supposed to be dead, might have inspired some writers to retcon Hal into a guy who doesn't honour the bro code. Given such a long publishing history, it's to be expected that most super-heroes will have had a harem of exes--but usually comic books forget those, whereas the writers selectively remember all of Hal's former loves. If you counted every woman that Superman and/or Clark Kent dated (some of which he was engaged to, if not married--before they died), he would be considered a Bluebeard.