This is very sad and I am sorry that this happened to you. Sometimes a boy can’t make up his mind and his advisers tell him to keep going out until he is certain that it’s “no”, so that he doesn’t make a mistake. Meanwhile the poor girl doesn’t know that he has this doubt and thinks he wants to marry her. This happened to my friend’s daughter and she was absolutely heartbroken.
But then, when the real one came along and she got engaged she realized how lucky she was not to have married the other, and how H-shem watched over her.
Now you are in pain and disappointment but one thing is absolutely
true, that boy was not your bashert.
May he come soon for you and every bat Yisrael.