I suppose it is possible he thinks I don't take him seriously, but I don't really think that's the problem here. I enjoy the lighthearted side of him, it's one thing I found attractive about him, though I also feel like he sometimes takes it too far - but he definitely thinks I sometimes takes the seriousness too far, and he'd be right! I prefer the serious conversations we have though, because that's more the way I'm inclined. I listen, I don't belittle his feelings...I don't think that's the problem here. I'm more inclined to think that I fall into the category of "interesting variety" for a while, since I think it's fair to say I'm quite different from a lot of his friends...so he pays me tons of attention intermittently, and then gets bored. If I had straightforward friend feelings for him, this might not be a big problem (though I value consistency in my friends), but given that I do seem to still have feelings, it is just making things hard for me.