Signs libra man is into you

I have a coworker who is a libra man and I am a gemini woman. I have a crush on him and wanted to know if he is also into me.

I am always helping him with his work. He talks a lot and shares gossip with me. He has done act of kindness like: pull the chair for me and hold the door. However I don't know if he is just being friendly or likes me. He has also been talking to another girl at work. How do I know if he is also into me or not?

I really like him because he is very kind and funny and we get along. By asking him this won't it break the friendship we have now?

He just smiles a lot and shares a lot of things that happened with me. He is always smiling. I don't know if it is his normal behaviour or just to me.

it's all normal behavior - Libra is extremely outgoing, charming, flirty, etc. just "nice" - so ask / tell him how you feel and see if there is anything there for him - if not, it won't break the friendship for him, if you can handle it

Libras and Gems will usually flirt in some sense just because they get along verbally very well. It doesn't necessarily mean much from my experience though.

I saw him eyeing me once when i was talking and smiling with another guy for a long time.