Suspicious

So, my boyfriend and I have been living together for 2 years, we stopped looking at each others phone about around then. I have used his phone from time to time and he has had the same password for 3 years. Yesterday, I he left his phone sitting down and I have been having this weird feeling about him lately and potentially cheating, well his phone password was changed? I brushed it off because I was snooping anyways and it has been a bit since I checked his phone. Well, he told me about this guy he met on a game on the ps4 a few weeks ago from Britian, I have heard this guy speak, so I know it is a man. I am pretty sure his name is like Tim??? Today got a request to play some game from "Megan", I said "who's megan?", he said "uhhhh someone I met on here from Britain, I told you about her, she always wants to play"

um what??

no you told me about a guy, who I have heard you playing with multiple times???

am I going crazy or