two-timing

Adjective

not-comparable

Sexually or romantically unfaithful.

Japanese Meaning

浮気する / 二股をかける / 恋愛面での裏切り行為

I broke up with my two-timing boyfriend when I found out he was seeing someone else.

彼が他の女性と付き合っていると分かって、私は二股をかけている彼氏と別れた。

Sense（1）

Sexually or romantically unfaithful.

That two-timing SOB really hurt my feelings.