What Is The Way A Man Can Show His Girl Friend That His Love Is For Her Alone?

A very intamite gift is to give her a piece of jewelry, or even a promise ring, let her know that if there was anyone you wanted to marry, it would be her, without having to make a commitment to marriage as you may not be ready.  Usually a school ring is best.  This is what they used to call a steady ring, which meant you were in an exclusive relationship

By telling her exactly what you think of her.  By showing her that you will do things for her that you won't do for other people.

Start paying attention to her more, find out the things she likes to do and out the blue just say; "Hey lets do such and such. Do something unpredictable, some you wouldn't normally do. Last but not least express your feelings to her.