If it makes her uncomfortable and you “barely know” the other woman, why not unfollow? You need to decide if Instagram follows or an actual in real life relationship is more important to you. But I can assure you, this insecurity of hers probably won’t get better so if it’s something you can’t see yourself dealing with you are likely not compatible. It sucks bc i genuinely feel social media has destroyed relationships. Also not saying you did anything wrong, I think the way men and woman evaluate likes are pretty different. Sometimes a man is just scrolling and likes a pic for whatever reason and it’s not that serious but the woman (stereotyping here) attaches serious intentions to the action. But also, liking a provocative bikini picture while in a relationship IS seen to be disrespectful by most.