My boyfriend is usually on whatsapp even if he doesn't see my ig message. when I discussed he said that I can access his whatsapp on my phone why?

My boyfriend is usually on whatsapp and he said that it's college group so he and his friends have accessed his whatsapp on their phone too. But its his number so i feel like there is something wrong so he is on whatsapp even at the time when he doesn't see my ig messages. when I discussed with him he said that i can access his whatsapp on my phone and he is just checking college related group updates. But I don't like to keep is whatsapp on my phone because i don't think if his intention is to cheat on me, accessing his whatsapp on my phone can't work out or he is just saying it to gain my trust. Is he really cheating on me or what? why i feel so anxious?

My boyfriend is usually on whatsapp even if he doesn't see my ig message. when I discussed he said that I can access his whatsapp on my phone why?
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