You don't have to take PrEP if you are 100% not having condomless sex. The current start/stopping official protocol is the following:
1) You take PrEP for 7 days to be fully protected. Some people say 2 weeks, but the doctors that run iPrEX say 7 days should give ample margin and drug buildup in the body.
2) You have sex during whatever period you may want.
3) Whenever you decide to stop PrEP you must keep taking it for 4 weeks AFTER the last unsafe encounter. Any sort of unsafe encounter resets the clock for 4 more weeks. If you just want to do 2 weeks, you can do a PCR HIV test after 2 weeks and if it comes back negative you can stop then.
Definitely no need to be on it if you are not having sex.