Snapchat?

Soooo.... I need some help . Me and my boyfriend have been together for 3 years . We have had issues before with him making a Snapchat account to talk to other girls . I made it very clear to him that this was his last chance . I recently got on my Snapchat and there is “add friends by phone number?” And his number is on there ? But I tried to log in with his passwords and none of them have worked . Not to mention it was a girls “bit emoji “ ?? I came to him about this and he said he’s not sure what it is . And that the person who had his phone # before him may have verified-there account with this number before he got it ?

Is this even possible? 💔