honestly, just ask her. the worst thing th at could happen is she’s straight. which actually isn’t that much of a problem. hehe ;)
mm, that’s always tough. firstly, i want to congratulate you on realizing you weren’t happy and ending the relationship. so many people would rather deny their true feelings and just stay in the relationship.
i think you should have a serious sit-down with your ex and tell him that you just aren’t into guys. explain how you felt unhappy and how you knew that you wanted to be with women. then, let him ask questions and answer them calmly and fully, no matter how ignorant they sound.
At the end of the day, there’s not much you can do for him. He needs to sort this out alone.