I feel like he is into you and he was under impression that you were single thus was shocked when you said you were pregnant as he had hopes!

As #25 says, maybe he thought you were single?

I have a hunch

A unicorn came by and cut my uterus open with its horn and the stork came by and then put a fetus in and finally the Flying Dutchman (or davey jones) came by and stitched it back together.. Really? It's pretty simple

Sounds like your boss is a simpleton

perv

Get a taco and a sausage. That'll do the explaining ;)

Its OK. That was my mother's exact words when we told her she was becoming a grandma!

"You see, when a man loves a woman very much, or they are both really drunk..."

When in doubt, explain it in song: ''When a man loves a woman~~~''. Or the birth control fails. Not that that's what necessarily happened with you OP but just so your boss knows that's a possibility.