Why would a guy say “when you dont pick up my phone I start to get in my own head and think you’re doing something with another guy”?

Why would a guy say “sometimes when you dont pick up my phone i start to get in my own head and think you’re doing something shady, And then he goes “i just start to distract myself by reading/ talking to friends, sometimes i tend to start arguments with people”

Why would a guy say “when you dont pick up my phone I start to get in my own head and think you’re doing something with another guy”?
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