If she’s really that important, you wouldn’t lie to her. And if she can’t understand that it’s old stuff, then oh well.
Well. You don’t need to lie. If she’s just a friend, tell her yall aren’t dating so she doesn’t have a say. I mean obvi think of a nicer way to say it If she truly is just a friend who acts like a girlfriend.... shes not your girlfriend. Soooo you can do as you please. However if yall have said you are exclusive, that yall are basically dating... then yeah, that would make you a shit person. Either way, own up to it. If you actually cheated on a gf, own up to it. Dont lie. Just admit your mistake. If she wants to forgive you, let her make that decision. If shes just a friend and you’ve been hoing around. She can get over it. Not her place.
So if it’s nothing super intimate or disturbing, tell her the truth. If they’re old like you say they are, then there shouldn’t be an issue. If she gets mad, then she gets mad. You’re not in a relationship with her (you said you two are just friends, but she “acts like a girlfriend”), you shouldn’t have to worry about upsetting her with pictures and conversations from the past. Give her some time once she gets mad and then you two will be good again. Also change your password and don’t give that shît out
Ok so two things 1) if she “acts like a girlfriend” and will probably get jealous if she thinks you’re texting other people then it’s probably because she thinks she’s your girlfriend and not a friend-friend. If that’s the case then you led her on. 2) if she was really your friend then there’s no reason for her to be jealous about you having past interactions with people, so just TELL HER!