It seems to go on all the time: men just happen to forget important dates, such as birthdays and anniversaries. It doesn't necessarily mean he doesn't love you if he forgets these things, but you know that if he remembers it means he's definitely head over heels in love. Your man is never without flowers in hand and a killer date night plan when it's a special occasion.
The fact of the matter is that it's not terribly difficult to ensure you remember an important date, however, you may need to set up some external reminders. The fact that your guy has gone to the effort to set alarms or add these occasions to his calendar shows that he really doesn't want to miss them. We think you'll definitely agree that this is a sure sign of a man in love.