kisses him, tells him she trusts him more than anyone else, hangs out in his crypt, kisses him some more, has very exciting sex with him, keeps trying to break up with him and then changing her mind, gets jealous of him, looks after him, talks to him, feeds him, rescues him, depends on him, spends hours cuddling him, refuses to be without him, protects him, has every single person who sees them together commenting on how much they're into each other and how "hot" they are together and how much they rely on each other...
...and still can't bring herself to actually mention that she might possibly maybe be in love with him.

I am the biggest sap in Sapville, so you'll have to excuse me, but OMG, seeing it broken down, so simply like that, it's like both "Duh! How could anyone still doubt it!?" and also kind of brings a tear to my eye. Sometimes I really do still miss them.