Hallo! Well, I've never watched romantic german movies, but I can recommend you this movies

Goodbye Lenin

Trailer - http://www.youtube.com/watch?v=mIjSaHUKD5I

The edukators 

Trailer - http://www.youtube.com/watch?v=UyT8bEa4XYA

Sophie Scholl Die letzten Tage

Trailer - http://www.youtube.com/watch?v=-k5mXzNjVLE

:)

Hello @Lucas ! Thank you so much for your recommendation. It's really helpful :)

Kein sex ist auch keine loesung is good, u can find it with german subtitles on youtube.

das boot is good too but without subtitles.

the greatest are the three parts of " unsere mueter unsere vaeter" you can find them on youtube and download the subtitles easily as a srt file.

Danke @Tammy !

In terms of comedy, Goodbye Lenin and Kein Ohr Hasen are nice