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Strange indeed I would have expected a car of that age to have remote central locking.
If this was never fitted or has been disabled or broken then it is not unusual for only one door to operate the locking system. but on much older models (1994-96) I have seen the 2 door system as you describe. If your system previously worked via either door then it sounds like something has gone belly-up and I would suspect either an internal lock lever has become disconnected
It is possible some other members may know different and may be able to offer advice if they spot this post.
P.S. As an afterthought can you feel any resistance when you try to turn the key in the passenger door-lock
Currently in madnoel10's garage:
Honda Civic 1.4l