How to I make my boyfriend Believe me?

So my boyfriend always assumes I talk to other guys. He sees my messages and yeah I do get messages from random guys who I don't know on Facebook or Instagram , but I DONT reply to any one of them. Maybe to tell them I have a boyfriend but other than that I don't. He always assumes I'm doing something bad when I take forever to reply and sometimes it's because I'm working or taking a nap.. I take naps like everyday and usually like two hour ones lol. But sometimes he thinks I'm out with guys. But to be honest. My boyfriend is the only man I want.. and that's no lie. I've noticed it's trust issues but how do I make him actually believe me?
How to I make my boyfriend Believe me?
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