Shoujo manga or anime where a male lead is inlove with the female lead but when someone point it out, he gets all angry and embarrassed,like "thats not it" or "its not like I did it for you". And they get super cute when they are jealous.

Some like this are:
Cardcaptor Sakura
Charming junkie
Last Game
Kaichou wa Maid sama(its reverse though)
Gakuen Alice
Yumiero patisserie
Kimi ga Kirai na Koi no Hanashi(Just love it)
Horimiya(Just love it)

Things I hate:
Harem(its not romantic when they have multiple lovers)
Age gap(Its Weird)
Incest(It's weird)
Same sex relationship (Not my thing)

Just wanna insert. If you've watch Charlotte, I like the confession part,LMAO, its unique but sweet too.