Yes, she is. She teased Yusei about liking her and when she met Aki she did a smirkish smile, not to mention Aki's father wants her with Yusei as well.
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no he doesnt cuz it never said but y do u want 2 no?
Well, in the last episode of 5D's, they did hold hands for a while...But people are still unsure.
Yes, she does. It's very clear after her duel with Yusei, when Divine had her under control she heard Yusei's voice and was snapping back to reality, and her and Yusei went on a date in episode 75 (sub version, which is the official version) where he holds her by the waist, catches her before she falls in which she blushes and he smiles. It's clear something is going to happen between them.
Yes they love each other. Actually it's not known. It is know that Akiza loves Yusei, as defined by Jack in episode 71 English version, but if Yusei loves Akiza then it is currently just guessed at this point. Right now in the story they are only friends but Akiza probably wants them to be more than that.
Keep dueling Yusei and defeating him until the heart fills in red. Same for all the other main duelists: Jack Atlas, Crow, Carly Carmine, Mina Simington, Tetsu Trudge, Akiza Izinski, Leo, Luna, Rally Dawson, and Misty Tredwell