Need advice please?

These past few years I've been texting the guy I'm talking to’s friends like on social media ( the girls that he's friend with) to ask if there's anything going on with him and this girl that I know from high school because I always see pictures of them on her social media like her instagram. On top of this I usually tell him that my stomach hurts because I get stomach aches a lot and I text his friends to tell them if he could answer my text. On the apps instagram and Snapchat and I got blocked by two of the girls. Is there a reason why they would block me? I messaged them on multiple accounts and but I'm confused. I don't mean to come off as annoying or anything to these people they say I'm harassing them which I'm not really sure what that means like I'm not familiar with the meaning of that word. What should I do because I'm anxious from all of this. I hate getting blocked on social media because it makes me feel like people think negatively about me and now I feel a bit annoying but I'm not sure how to stop like i get the urge to message them a lot
Need advice please?
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