How can I tell if someone is in a party on PS4?

Anonymous
So my boyfriend is playing a game on his ps4 called apex legends. It shows as 1/3 and players in session as just him. Does that mean it's just him or is it a party he's in but it's not showing the two other people he could possibly be playing with.

I need to know so I know whether or not he might be playing with this girl that disrespected both of us after an argument. I want to see if he's that stupid to disrespect his relationship with me to play with her. If he is, we're done.
Updates
+1 y
I asked casually who he played with before I came over and he claimed he played with his best friend and a guy.

So I guess the 1/3 was him playing with others. Not sure if it was party chat created in message though.

He's playing a game with his friend and it says 1/5 but it's only two of them playing.
Updates
+1 y
Correction, there are five people playing together. So for some reason it shows as just him 1/3 or 1/5 when the second number indicates how many people are actually present
How can I tell if someone is in a party on PS4?
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