I love him but can't say it

I've been with my boyfriend for a while now and I know I love him. He has all the qualities I look for in a guy and just the way he makes me feel when I'm with him is practically indescribable!!! But I'm too scared to say those 3 words to him. What if he doesn't feel the same way and we can't be the same afterwards? Any advice would be helpful!!😭