just look on the phone's notifications to find out. but something tells me this is not your phone. we get this question almost every day here. the main problem is that there are probably hundreds if not thousands of apps that use a heart icon. it can be anywhere from a health app to dating to even personal wellbeing. so unless it is something popular like youtube or facebook, most of these questions go un-answered.
just ask the person. i know it is easier said than done.
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