How do you know if a guy is going to ask you to Marry him?

There may be signs that let you know a guy is going to ask you to marry him that can include him telling you that you are the only one for him. If you have been dating and in a relationship for a considerable time, he might be thinking of asking you. Since each guy is different, they are the only one who knows what they are thinking and if they will ask someone to marry them.