It is true that most women just get hooked to the "wrong" person because they were unable to tell the man they love that they had feelings for him. This is bad to let the person you love to just go because you could not say the word.
Show interest
This is a simple way to make him notice that you have a crush on him. For instance when you see him attending to his daily activities but he never saw you, in the evening call him up, "Hey John, today noon I saw you looking handsome in the blue blazer you were wearing". He will know that there is someone interested in his style.
Flirt with him
When texting show him that he is the great guy you have come across so far. Tell him how handsome he is and how you spend the whole of your day thinking about him. Additionally, you can mention how you wish that the two of you could be hanging out together every single day. This will show that you really are into him.
Tease him
Try making fun of all his aspects. Find out if he also likes you. This is because a person who likes you will never get offended when you make jokes about his aspects of life. In this case try asking him, "Hey John, why are you still single?" Not everyone gets to ask such questions, he will know that you have feelings for him.
However, in doing this make sure that there is some form of modesty, don't do it without limit, because he might get annoyed and think that you are after other things which might ruin your chances. In addition, some men can take advantage of this so when doing it, it is good to be cautious.