I remember only one scene from the film: there's a scene in a house with lots of forensics in white overalls and masks investigating everything. Then comes in the main character who wants to talk with his ex girlfriend who works there. They talk and he finds out she's now dating one of her colleagues... It was probably some silly comedy, fairly recent one.

Hi there!

Sounds to me like the Simon Pegg film Hot Fuzz

http://www.imdb.com/title/tt0425112/

Happy Watching!

Yes, that's it! I've seen this film several times but I completely forgot about it and this scene just wouldn't get out of my head. Hopefully it'll leave me alone now when I know the title :) Thanks so much!

My pleasure! :-D