How do you know if you’re the only person someone’s talking to/fw?

?

Edit- I feel like the dude I’m talking to/fw is talking to someone else. I’ll probably ask but it’s not like he’s gonna tell me he is/if he is he’ll probably just lie and say he isn’t. I only have him on snap & have his number lol he doesn’t use fb so I can’t investigate 😂

Edit- I just feel like he’s talking to someone else, his snapscore goes up so he’s obviously talking to someone. He does have facebook but I’m not friends w/ him on there & we aren’t together so I can’t see what apps he has on his phone lol. We did stop talking for like a week at one point & 4 days before that but we’re talking again. I feel like in that time he’s been fw someone else and probably still is

I just want to be sure that he’s only fucking w/ me because that’s what I told him I wanted & he said he was fine with it & could do that🤷🏻‍♀️. (Idc if we aren’t together lol I don’t want to mess with someone who’s messing with someone else, that’s disgusting imo)