1. It felt awkward to run into my ex-boyfriend at the party.
2. After their break-up, she was happy to see the back of her ex-boyfriend.
3. Seeing her ex-boyfriend with another woman, Lisa couldn't hide her anger, and her face turned red, resembling a face like thunder.
4. If you stay home because your ex-boyfriend is at the party, aren't you cutting off your nose to spite your face?