Bumble also puts a 24-hour limit on that initial hello; JSwipe matches disappear after 18 days if no one says hello; and Tinder matches never expire.
Hereof, how do I know if someone unmatched me on Tinder?
If you get unmatched tinder flags the accounts of both parties against each other. That person will never appear in your feeds again. If you get unmatched from another person, you will not be able to see them without performing an account reset.
Beside above, why does Tinder delete all my matches?
If you notice that your matches have suddenly disappeared, you may be having server problems. Try restarting your phone and refreshing your match list. Rebooting your phone might solve your problem. Sometimes, Tinder accidentally deletes matches.