While you are waiting for the book there are a few things that you can do. He is a very patient man and will appreciate that you are trying to be able to open up and express yourself more. You were probably emotionally closed down when you were a child and you need to overcome this. The book will help.
Here are some ideas for you in the meanwhile:
Be very patient with him, give him time and space to show his feelings for you, and he will give you the time and space that you need. Don't make demands or put limitations on him and get to know all about him.
Accept him for who he is and put your attention on those qualities that attract him to you. Don't try to change him but love his just how he is.
Listen to him with great attention when he speaks, and if he needs to talk about his problems, let him talk freely without judging him. He may have other stress and he needs you to turn to make him feel better. In this way you show him that you love him. When he supports you, understand that this is because he loves you.
It is NOT words but deeds that say you care.
If you need to tell him something he may not want to hear, tell him gently and let your love for him help you choose the right words. Never be harsh and never look down on him.
You don't have to say I love you if that is hard for you to do. Instead show it with with your actions, which should be gentle, caring, and consistent.
When you are with him, make sure to look into his eyes and let him look into yours. The eyes are windows into the soul and you can show him the love inside of you by allowing him to see it in your eyes.
I have one more book by one of my favorite authors in showing love. This book is easy to read and will help you a great deal:
I wish you great blessings and warm regards.