Would a guy only message a girl back to be nice to her and be friendly OR is he interested?

I’m wondering and need help, so I met a guy through work and over the years we lost touch. Recently we reconnected and he is responding to my msgs and is friendly, asking me how I am etc, but previously he would say how amazing I looked and he knew I liked him. Now I want to know would a guy respond just to be nice and friendly OR is he interested? Like would a guy respond at all if he didn’t care?

Would a guy only message a girl back to be nice to her and be friendly OR is he interested?
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