He casually says "I love you"?

These days sometimes when I'm with my boyfriend we'll be casually talking or joking and he'll say "i love you" but not say it directly TO me..I'm not sure how to take this.

Example, we were joking about something and he said "I'd call you and say "i love you!". It was in a pretty casual situation, and I just continued on with conversation.

I'm not thinking its anything serious because if he was saying it for real, he'd be clear about saying it, right? I don't want to make a huge deal out of it but at the same time I don't want to keep "ignoring" it if he really does mean it, because I do love him too...I'm just scared to say it.
He casually says "I love you"?
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