boyfriends are magical

Does anyone else's boyfriend track their period? Like my boyfriend tracks mine better than I do! He knew it was gonna start today and it did and my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> tracker said I had 3 more days? How does he do it??? I think it's so awesome! He makes sure I'm prepared, comfy and stocked up. But how does he know????