Why is my ex stalking me on social media? what should I do about it?

gaiarose
Long story short, my ex has been adding me on social media several times months after we broke up (after he said that he wants to become friends with benefits and does not want a serious relationship). I have moved on since then and found love, and am in a happy and committed relationship with an amazing man.
I have tried to be nice to my ex at first and let him view my stories and posts (and my boyfriend is in some of them), but I always feel a bit uncomfortable knowing that my ex is watching me on his phone/laptop. One night, he called me and told me that "You're not better than me just because you have gotten a boyfriend."
I blocked him everywhere afterwards. Today, a month later, he managed to find me on snapchat and added me again. What should I do? Why is he stalking me non stop?
Why is my ex stalking me on social media? what should I do about it?
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