[tsarast]

Would sweetluvin call with a hand like A7o? I tend to think that's pretty poor play to call reraises with bad offsuit aces. And considering the As comes on the flop the only way he can turn a bad ace into a bluff (to get you off AK, AQ, etc..) is by calling with Axo preflop, taking a reasonable line to the river, then shoving to get u to fold a small % of your range (big offsuit aces with no spade), when he can still beat a huge part of your range.
That said I think you've outthought yourself on this one, and I think it's a fold. His check behind on the flop also lends itself to him having a big spade in his hand (though perhaps not the Ks)