That's a fair point. A lot of behavioral data can be gleaned from collecting someone's shopping habits, browsing behavior, general communication trends on various platforms (directed or not to their partner).
The heart rate and biometrics would perhaps let you know the when of the event, then, and not that it was on its way. The same predictive techniques could work for other events as well (has he been buying a lot more home goods recently? maybe he's about to ask you to move in).
