An American thriller

(Probably) American film, from the late 60s to late 70s. The one scene I remember is a (blonde?) criminal, possibly on the run, visiting a young shy looking woman wearing glasses in her flat.
They sit down at the table, he asks her if he has a boyfriend, she says 'sort of' and he says 'either you do or you don't' so she says 'well, no'.
Then something happens that makes her go for the exit door and he starts pointing a gun at her and tells her to move away from the door or he shoots her dead. 'Lock the door and give me the key'.
Then she gives him the key and says something like 'so that's why you wanted this place, a room with a view'.

It probably is not one of the most well known ones.