ID this artist from 70's "Why'd You Do It?"

Female sings in great anger about lover’s infidelity. I think the name of the song was “Why’d You Do It” but if not, the line is in the lyric. Another memorable line was something like, “Every time I see you I see her c*nt in my bed”. I can’t remember who sang it.

Why d’Ya Do It?
Marianne Faithfull
Broken English
1979 Polygram Records

lyrics
(sorry about the popups)