Guys, give me some advice please?

So I work with a guy and he is quite new. We are starting to catch the train together home and he is always talking to me.

I never actually INITIATE contact as he always comes up to me.

I find him extremely attractive and I don't want him to lose interest in me quickly.

Yesterday, I think he waited for me to leave and followed me to the train and he takes the train earlier than me.

I am afraid that sometimes, people want to have some alone time so should I keep him interested by avoiding him or taking another route and then catching the train with him another time?

What should I do?
Guys, give me some advice please?
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