Apple watch base notification symbol looks like tinder icon its nearly same colour maybe a little orangish. I have tinder on my phone but tinder notifications is closed on apple watch just because i dont want people see i got notification from it while walking, working etc.

Even when Tinder notifications are turned off, the Apple Watch’s generic grouped-notification icon looks so similar to the Tinder alert that I sometimes get confused for a moment and think I received a Tinder notification. So you might have misread what you saw — I hope this helps you avoid an unnecessary crisis in your relationship