noun
love affair; romantic entanglement
Often implies a complicated or troublesome romantic involvement, sometimes with a hint of scandal or gossip.
彼は職場で色恋沙汰を起こして辞めた。
He got involved in a love affair at work and quit.
あの俳優の色恋沙汰が週刊誌に載っていた。
That actor's romantic entanglement was in the weekly magazine.