I don't know what else to say to convince you to test, but here goes

I always test, then if BFP tell DP that we are pregnant. I always think that he would be so disappointed if we did the test together and it was -ve. He then would see me upset and at least testing without him allows me to be over it by the time he gets home.

If you do a test and it's a BFP, you could wrap it up in a nice little box with Xmas paper and give it to him for an Xmas pressie. I am sure he would soon forget that you didn't do it with him.