I am sorry to hear about your unfortunate experience with your ex.Locking your phone via your watch is only useful in the above scenario IF you're AWAKE to respond to the unlock. So you haven't fully tried this properly - not in a deep/REM sleep stage.
Apple Watch Unlocks a connected iphone in the same room or home as long as in bluetooth range - OR on same WiFi access point. I've specifically gone through this myself and an ex personally. I didn't do anything wrong in the relationship, just a psycho/clingy ex reaching out for a long-shot,hopefully-booty-call which was denied when brought to my attention. Ex is an Ex for a reason and the recent one - lack of trust
The difference with Touch ID is you need to guess amongst 10 fingers which is the right one
Watch Unlock you don't need to guess and also TouchID nor FaceID to unlock is needed.
Think this through, you'll see how right I am![]()
For the watch unlock, I don't have the habit of sleeping with my watch on, so anyone wishing to unlock my phone in this manner would need to first place the watch on my wrist, as well as know both my watch and my phone passcodes (in which case he / she would have been able to access my phone anyways).
As for touch-ID, I am guessing that the majority will scan their thumbs, followed by their index fingers, as these are the digits most commonly resting on the phone / iPad when in use.
There is no foolproof solution here. Both features make reasonable tradeoffs in terms of security in order to ensure maximum degree of convenience for the end users, and my only conclusion is that they can either amplify the ramifications of a good or a bad relationship.