german tv series my teacher showed me in high school?

i studied german in high school and i remember that one time my teacher showed us a scene from a german tv series which came out in the 2000s and he said was quite famous in germany at that time. honestly the only thing i remember about it is that there was a love triangle with a lesbian involved? i remember it cause i remember thinking that it could have never happened here cause our tv is very conservative. and yesterday this just came back into my mind and it bothers me that i can’t remember the title.

EDIT: i think it was more of a comedy and we watched it on youtube so i think it’s possible the whole series is on youtube?