My boyfriend doesn't know how to help me with my anxiety, how can I help him?

I have awful anxiety. Basically affects my day to day life, I'm in therapy, have tried medication, etc. I lead a very normal life for the most part but sometimes it's very difficult and gets frustrating. Looking at me, you probably wouldn't know it, so I only tell those closest to me. My boyfriend (who may be the most chill person on this entire planet) never really knows what to say/do to help me. He'll give it a bit of a try but if we're on the phone sometimes it'll just be silent for a bit because he's not sure what to say and I can barely think straight. Would it be rude if I sent him a really good article I found online (http://www.heysigmund.com/when-someone-you-love-has-anxiety/) about helping someone with anxiety?