What does it mean when a guy change his password to my name?

This guy was my pervious colleague and he thought me so many things. At work we used to spend so much time together. Talking, laughing, joking and supporting each other and get closer everyday as friends. We follow each other on social media, talk on WhatsApp, he knows that I am with someone yet he told me that he changed his password to my name instead of the old one. He likes my posts, see my videos quickly when I post them and comment or joke about them. Am I overthinking this?

What does it mean when a guy change his password to my name?
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