Woah, how can You all write this much...?

And I don't really get Your point. Are we arguing if Cloud loved Aerith and not Tifa in FF7...? What is it have to do with Advent Children...?

What I see from the compilation, is Cloud had a childhood crush on Tifa, which is a very emotional feeling for him. If Aerith would not come in the picture, then Cloud and Tifa would definetly become a couple.
But Aerith came, and Cloud fell in love with her. They would have been a very nice couple, but Aerith died. After that, Cloud was depressed, thus, he lost his lover, and he did not end up with Tifa in the game.

Meanwhile, Aerith's "spirit" is wandering in the lifestream, she interacts with everyone, and she meets up with Zack (Maiden over the Planet). They interacts (possible Zeris hints there, but nothing solid proof), and after some time, they actually watch the whole lifestream scene, where Tifa helps Cloud get himself together.
After that scene, Zack says:
"Cloud got the girl now"
And Aerith says at the end that although she's a little bit jealous, but she leaves Cloud and the world at Tifa's care.
So from this, it is very much clear, that Aerith lets go of Cloud.

After the game, Cloud started to let go of Aerith's memory (talking about Case of Tifa now), and started to live his life with Tifa, Barret and the children, and with time, he even started to show some affection for Tifa (I consider this as he has romantical feelings for her, but he can't let them out, until Aerith's memory still inside him as a guilt). The problem is that he couldn't let go of his guilt completely, so Cloud and Tifa did not get much closer in their relationship. Yes, I see romantical love from both sides, but Aerith's memory is still in the way.

After that, came the movie, where it was shown, how Cloud lets go of his guilt, and at the end, he lets go of Aerith. Of course, he will remember her forever, and she'll have a place in Cloud's heart as a lost loved one, but Cloud now can move forward, and this suggests a very big posssibility for Cloud & Tifa, because Cloud can let his feelings out for her.

This ends Cloud's story.
What happens in the future, is based on our imagination, and if Cloud and Tifa will properly get together, is also the sound of the future, but I see a big possibility for them.

Well, that's it for now, I hope my explanation isn't too chaotic... The truth is that I'm awfully sleepy now, and I used to mess up my english grammar, when I'm tired...