Help advice is needed?

I don't know but my fight or flight senses went up. I went to unfollow some people on spotify and my boyfriend has a playlist for me on his spotify account. So I went to check if he added any music on it and I saw he had another follower on his spotify and followed more people. Being the person I am I looked. It was another girl. I never heard of her before so I went to his instagram to see if he followed her there as well and he does and it’s private. I don't know why but like i just wanna know why she follows him and how she found his account because honestly when he first was making the playlist, i couldn’t find his account and i searched up different names etc everything and nothing appeared. it has me questioning how she got access to his account.
Help advice is needed?
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