A chracter shows up to another character's house on the other's doorstep (maybe injured) and says: I didn't know where else to go or I didn't know who else to go to. Sometimes followed by Who did this to you?

the enemy villain turns up at the main characters hero's doorstep, injured, saying: “I didn't know where else to go.”.

They get injured so they have to go to their enemy

I had nowhere else to go