It wasn't for her sake. He was guilt tripping her and using her situation as a crutch to get her for himself. As for the mother..well she is a liar, a hypocrite, and not worth listening to. Ai is right to follow her feelings and it's refreshing. So many shoujo heroines let themselves be led but she goes with her own wants.
he was emotinally black mailing her as to when he asked her out and scarifice isnt just a normal word if ur on this website u know its main point is yuri and yaoi imagine the ppl who really are gay and lesbian they have had make so many scarifices so many struggles from within the family to protect it they have to shut up about their love cause why one stupid reason "reiligion dosent accpet it"or "what ae the ppl gonna say "
like that ai here is in love with him whats wrong with that and why cant they love each other .
Somehow, im a little bit disappointed at ai. I mean, snpai san has asked her out, also for the sake of herself. But instead, this ai would sacrifice evrything she has(family,friends) just for the sake of a love which can never come true （￣へ￣）