Can someone identify this icon?

This is slightly embarrassing but I'm asking none the less. My partner sent me a screen shot today and there is a notification icon at the top of the screen (two overlapping hearts). Is anyone able to identify this? I'm in an ldr so I'm not able to check physically. He's sleeping right now so I can ask when he wakes I just wanted some peace of mind. If anyone can help I would be very grateful. Thanks

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