spill one’s guts to someone
spill (one's) guts to (someone)
slang To speak truthfully and share everything one knows or feels to someone, especially about a sensitive issue or a wrong one has committed. I'm sorry for spilling my guts on you like that. I just haven't had anyone to talk to since the divorce. Most people don't like it if you spill your guts on them after they casually ask you how you are doing.
spill one’s guts (to someone)and spill one’s guts on someone
tv. to tell all; to confess; to pour one’s heart out to someone. (see also spew one’s guts (out).) I had to spill my guts to someone about the broken window.