'존심' is a slang and it is short for '자존심' which means 'one's pride'. '자존심(이) 상하다' means 'someone's pride gets hurt'. '잠수타다' is also a slang meaning 'to keep out of touch from other people'. '잠수' means 'going underwater'. So '잠수타다' would be like 'to go off the grid'. '존심 상해서 잠수타고 여기로 왔네' means "I guess you came here because someone hurt your pride and went off the grid." Hope it helps and please follow me at koreanclass.canada on Instagram!