Whether someone’s actually having sex outside of the relationship or not, here are six signs that a partner’s online activity is threatening to your relationship.
https://everycathasatale.blogspot.com/2019/10/digital-cheating-infidelity-in-modern.html
Magickal Connections 
If your partner doesn’t agree to your online behaviour, and you are hiding it from her, then you are cheating. It’s as simple as that.
Yeah, those definitely are key signs that your partner is cheating or flirting in an appropriate way with someone, because if you got nothing to hide, you’re not going to be that guarded with your partner on what you’re viewing.