<human>: Can you succinctly summarize the text in 1-3 sentences?

So I've been having problems with my boyfriend in the aspect where completely out of nowhere he stopped caring.  He's not jealous like he used to be, he doesn't want to change or anything, doesn't want to talk anything out if we're having problems, doesn't speak to me like he used to or try to keep a conversation going. It seems like its all on me.
He would even mood swing and break up with me then completely regret it/take it back moments or a day later.  
But after him being on his android phone while I was with him I noticed on the top left of his screen a black heart notification with a white chat box around it.  Can anyone tell me what app that is (because I'm scared to think that it's a dating app notification)
I've googled it for I don't know how long and barely anything comes up on it. Can someone please help?
<bot>: Boyfriend might be on a dating app while dating me. Can someone tell me what symbol for the white chat box with a black heart in it is from google play?