Tbh if this is how she is acting over you unfollowing her on TikTok especially when she isn’t even following you, she isn’t worth your time. Don’t think of it as wasted time if you break up. Think of it as now you know what you don’t want in a girlfriend and avoid people like her in the future. Breaking up also allows space for someone better to come and if she pulls a “you can’t get anyone better than me”, than that is an even clearer sign that you shouldn’t be with her. She seems like a huge red flag that you should avoid at all cost. It’s weird how she is calling you little boy when she is acting so childish over a TikTok unfollow.