HE SAID HE LOVES ME;I ASK WHY

Ha ha! The funny thing is, he said "You're probably going to blog about this, aren't you?" Anyway.

Before he left for Bangkok for his work, we were saying our goodbyes and I love yous.

Here's how it went:
Me: I love you
Him: I love you too.
Me: Really? You really love me?
Him: Yes, I really do love you, with all my heart.
Me: Why?

Then it became silent. He stuttered a bit.

Him: I love you because, ..., uh, UGH! Why do you have to put me on the spot like that?!?

Should I be upset that he can't tell me why he loves me? He didn't say anything for a long while. Approximately like 30 minutes. After that while, he hugged me. And we started talking again.

Him: Why are you so quiet?
Me: Me? You're the one that's been quiet! Ever since I asked you that question.
Him: I just don't want to sound like a idiot when I answer you.
Me: How are you going to sound like an idiot answering a question like that?

I felt like I was being sorta mean, but I was just messing with him because there shouldn't be a reason why he should stall on a question like THAT. Anyways, he attempted to answer but failed!

Him: I love you because you love me
Me: Ew! So you're saying that everyone that is in love with you, you have to love them back?
Him: No no! See, you're probably going to blog about this aren't you? Just because I can't answer your question
Me: Well it's a simple question! Why are you with me? There should be a reason you love me. You say "I love you" with no reason behind it?
Him: Can you tell me reasons why you love me then?
Me: I can tell you MANY reasons why I love you. And I wouldn't have to wait 30 minutes and stall just to answer the question.

Lol. Yeah, this conversation didn't really end the way I wanted it to. He told me little tiny things why he loves me. Like "Because I deal with his nerdiness" or some little things I do.

What do you think? Should I be upset that he couldn't answer the question like I expected him to? I was thinking that maybe he doesn't really know what LOVE really IS. We've been together for almost 2 years now. And I love him more than he will ever know. But I want the feeling to be mutual. Not just me loving him with all that I am, but him doing the same for me. At times I feel like maybe he likes the company/hugs/. But he doesn't really know the true meaning for love.