What's with all the games?
If you feel like he's lying, leave.
If he's lying, or innocent (Perhaps it is an old account that he forgot to delete
. A lot of people forget they have old accounts.) Perhaps he thought he deleted it long ago...Regardless he knows you and your "friend" (you?) are behind the recent messages and he's playing along.
How do you know he didn't use or have it on his phone firstly, but downloaded it to firstly see what you were talking about when you mentioned an account, secondly to try and remove it permanently??
Sounds like you never trusted him, perhaps trust issues from previous relationships carrying over??
For someone who allegedly trusted him before this, you sure are on a mission to try and convict him..there's no benefit of the doubt.
Has he cheated and acted inappropriately in the past??
I ask because you seem paranoid and perhaps the thought that he could be has been long running in your mind.
Did you really intentionally download the app to see if he was cheating on you because you heard previously from others about app cheating boyfriends??
"I know my friends have has bfs that have used Snapchat as a way to cheat before,so I'm unsure"
"It's just I've heard a few times that Snapchat is a popular way for men to cheat"
How do you know it's an actual screenshot of his this app phone?? How did you verify it?? You're snooping through his phone???
Has it ever occurred to you that your "friend"(kinda think it's you tbh) perhaps is lying or has falsified these messages??? Perhaps (if it's not you) the messages were created through a fake app, or perhaps they may be sending you messages from someone else??
There are jealous people in this world, who do things like that. Intentionally causing rifts trying to break up relationships. People that don't like to see others or specific people happy.
You said that you've been together for a few years....Do you just want to leave the relationship, because you don't need excuses or an "out" to leave...perhaps it has run it's course?
Regardless if cheating or not,
Are you going to leave?
You'll never trust him again(if you ever did)