Rebound relationship noun phrase
When a person is suffering from the emotional stress of detachment after their breakup, they begin a romantic relationship in order to recover or move forward, it is called a "rebound relationship".
When you have painful emotions after a breakup, you should be cautious about a rebound relationship. It can hurt you badly.
I bet you she is in a rebound relationship with James. She doesn't love him at all, she just wants to stay busy and forget about her ex.
The term's use dates back to at least the 1830s when Mary Russell Mitford wrote of "nothing so easy as catching a heart on the rebound"
Daughter: So I really want all my friends to have a great time. I was thinking it would be a good idea to have some candy out on the tables for people to snack on.
Mother: Well, if you want them to really enjoy themselves, candy is dandy but liquor is quicker.