Hello, and welcome to Final Fantasy Answers. What question do you have today?

Debatable. Cloud spends all of VII conflicted between his childhood crush Tifa and his newfound romance in Aerith. Both have issues: Tifa wants things from Cloud he feels he cannot live up to, while Aerith suggests she started to like Cloud because he reminded her of Zack Fair, her first romance and the SOLDIER that Cloud retains the memories of.

Advent Children compounds the issue; Cloud has not resumed a relationship with Tifa because he is still guilt-ridden over Aerith's death. The movie does suggest that he comes to terms with it, however, and it is clear that he has a surrogate family with Tifa and Denzel.