It's very simple. Watch his actions. Don't listen to his words, because his words sound wonderful, but it really doesn't mean anything unless he backs that up. For instance, if he says I love you and I want a relationship with you, but he goes out to parties and does not call you until 2 o'clock morning, that doesn't really match his words. Also watch to see if he introduces you to his friends and family. Does he bring you to work events and parties, or does he take a buddy? Whoever he spends time with is in his inner circle. If he brings a woman to those events, he is serious about her. It doesn't necessarily mean, he is going to marry her, but it means he is having a relationship with her. Watch his actions. If you are really a fiancée, he will put a ring on your finger.