Why won’t he block his ex?

So me and my boyfriend have been together for some months. Anyways he has a ex that recently followed him on instagram, he requested to follow her back shortly after. Since then she has been liking his stories, she even sent him a DM and quickly deleted before he could see it. He ignores her and hasn’t reached out to her despite her direct out reach towards him. Yet he views all her social stories that she posts? Why won’t he just unfollow/block her? He claims he doesn’t want her.

Why won’t he block his ex?
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