I'm glad you like me
This means "why on earth did i fall in love with you"
Genki ni natte
The cast of Harusaki Azumi ga okusan ni natte ageru - 2007 includes: Azumi Harusaki
It means 'Why did I fall in love with you?' but i don't know the literal translations, its a song by DBSK, that's how I know!
The correct structure would be "Kimi ga suki ni natta," and it means "I came to like you."
"[I'm] going to tell the person [I/someone] likes that [I/someone] likes them."
I'm so sorry... I'm a terrible girlfriend... *cue fake tears*
好きですか? Suki desu ka? Watashi/Boku/Ore no koto, hontou ni suki?
[Sore/kore ga] hontou ni suki desu.
Anata ga hidoi tte? Dakara nan na no? Motto ii hito ni natte.
You may say "anata/kimi ga hontou ni suki desu."
"Watashi no kanojo ni natte morai masen ka?" is polite and decent way of sayng it, but the casual way sounds better: If you are informal and friendly with your listener you can use 'Boku no kanojo ni naru no ka?'