Asked about my birth control?

So I just started seeing an older guy, he has two grown sons already, and the first night we slept together he pulled out, 2nd night he asked me if I was on birth control and when I said yes (I have an IUD), his reply was "what the hell, you are?? That's no fun, you could have lied to me."

Normally the reply I get is "Oh, good!"... not that....that was definitely a first.

I'm gonna ask him about it, maybe he was just joking, I'm not sure he's not normally that kinda guy when it comes to serious things like that, but what do you ladies think? Maybe he's thinking more long term???