Stay friends or run like the wind!
I speak from 10 years of intimate experience (and knowledge of others)
He is wonderful and so pleasantly calm, sweet and (gasp) appears to want to know and talk about you. They seem to be Virgo-like but they are finicky pussycats to the ninth degree. I struggle to find one who hasn't driven a woman bonkers with their undefined moodiness when they sit there and worry and wonder themselves to death whether or not you're the perfect catch; they will dangle you forever if you let them.
Keep it fun, platonic and flirty but don't throw your emotions into this one. You'll be crushed repeatedly. But (as a friend) he can be great loving ally.
Do you mean people with this kind of natal chart? Or Leos in general? I think you could be right about the way he acts, though.
I realize from what you said...He is moody about the weirdest things, and he seems to get annoyed at the smallest actions of others. I think that is "moody", right? Although it hasn't been directed so much at me, I can see some of his Virgo-ness coming through because he nit-picks about lots and lots of things (examples like how I need a jacket, need to eat breakfast, etc.) If I am just your friend, why does it matter if I ate breakfast that day?