How do I know if my male friend likes me without asking him directly?

My male friend (M31) and I (F29) have been good friends for over two months. We usually don't hang out much except when working together on a project, but we went for a walk and had lunch together a few times. We shared similar interests, so we enjoyed talking with each other. A couple of weeks ago, we started talking about a holiday plan. He asked if I would like to go on a day trip with him on Christmas Day (we both don't celebrate Christmas), but the trains don't run on that day, so we decided to hang out in town. When I said I would be going on a one-week vacation trip after that, he told me he could join me (we are both single and have never dated someone before).

The thing is, I really like him (more than just a friend), but he never shows any sign that he is interested in me (at least that is what I believe), and I'm not sure what he was thinking when he said he wanted to travel with me - i. e. does he only wants to spend some fun time with a good friend or is there something else going on?

Do guys typically go on a trip alone with a female friend? Any suggestions on how to find out what he is thinking without asking him directly?

How do I know if my male friend likes me without asking him directly?
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