Lol he just seems to give up easily. I say that with love because its totally me. I get awesome intentions of surprising H with stuff (which he would totally enjoy) and I can keep the secret for about 5 seconds. If he mentions anything remotely related I'm like "omg I can't keep it in!!"
As long as your H doesn't actually seem upset I wouldn't worry too much.
All of this. I am terrible at surprises and I always beg H to tell me what his surprises are for me.