Signs a Scorpio is interested/flirting?

There's a new guy at work who is a scorpio that I am attracted to but I can't work out if the feeling is mutual or he's just being friendly.

When we're on our own, he always asks me questions that are more than just work, asking about weekend plans etc. we have good banter and laugh together.

There have been some occasions where I've walked into a room said hello and and he has barely looked up or he's come into my department, interacted individually with all my team members and completely ignored me. This happened the day after we had an icredibly funny interaction so had left me reslly confused.

I've never dealt with a scorpio before so I have no idea if it's a silly game or he's just straight up not interested.

I'd love to know more so I can put the work crush to bed if it's just me wishful thinking.