Parents are sometimes so emotionally involved with their children that they forget how to be supportive. They cannot watch things from a distance and be supportive whatever happens, they feel the need to criticize or warn rather than listen and support because they are so worried about what might happen and are frustrated that the child is old enough to make his or her own decisions, but is making “the wrong ones”.
So of course that can’t make you feel any better that your mom seems to think she knew better than you what would happen. Because you already feel played, and foolish for trusting him, and now you feel doubly foolish because she’s making you feel like you should have known. But this happened because you too are still very young and you are entitled to making your own mistakes and learning from them. Even if you made a mistake and got hurt, this still is YOUR life. Your mom can’t live it for you. So be proud of yourself and of your mistakes, it only happened because you’re a good, trusting person and you probably would never act the way he did, so you didn’t expect someone to act this way towards you. Learn from this, grieve for a while and then move on.