Why do I have 2 same Accounts but?

I noticed on my Instagram messages that I had 2 same accounts witch I found crazy so I clicked on 1 of them and it went to my normal IG messages but the other one I clicked went straight to my boyfriends”Facebook account then when I clicked on the Dial it said on my iPhone incoming call from… my boyfriend😯Is he making a double account to see my FB message cuz it’s our tablet but different passwords? So he’s spying on me ?