maybe I am a little naive liking him since I don't know him.
I suppose so, if you don't know how he really is. But it is possible that God can have someone get your attention, if He wants you together, even though He knows more than you do. It is good to be able to make sure with God

> not only try to make sure with a person.
so far he hasn't tried speaking to me either.
He could already be busy with someone close to him and ones he already is sharing with. If you do not know how he shares with and helps others, it might be wise to go easy.
Well, that can mean different things. There are couples who are interested in each other, but they want to mix with other Christians, since we all are family.
If he is for real, be thankful for however you do share. Because if he is for real, he wants to do God's will and so he is praying for how to relate with you if you two are somehow sharing.
And whether or not you are meant for one another, still you are brother and sister in Jesus.
From the male perspective, how do you show a girl that you like her?
I pray. And I observe and listen to her. Then I can know what she wants and how to please her, if it is in a good way. But if she is saying she wants things which I am not satisfied are God's will, I do well not to try to push her from what she really wants. But pray for her to change, in any way which is for her own good.
I would say feed on scriptures which give us how to relate with one another as God's family. And stay with this, in how you relate with someone you are considering.
if he truly is interested he will make his intentions known.
If you are meant for one another, things can open up so both of you say things you have to share. If he is for real, you can trust him by telling him your personal things. But I would do it being open, since a for real guy very possibly already has someone he is committed to or interested in. So, be ready to be a good sister
Possibly, he is not as with it as he might seem; he could be on his way to making a mistake; and if and while he makes a mistake in whom he chooses, you can pray for him and prepare so later you will not be his . . . or someone's . . . mistake. Then you might find yourself connecting with someone else and very surprised how satisfied you are.
So, trust God.
Because how you are now can limit you; but if you grow more, then you can have better sense about who and what you are looking for. So, it always is good to pray and trust God and grow
Does God bring people together or do we decide who we want to marry?
He brings people together; and if we have been submitting to Him, we are very glad

He has good surprises so better than what we have been looking and hoping for
It can be that we choose the one God has chosen for us. But then we discover how He makes the choice so much better than what we thought we were choosing so smartly
You should be friendly and attend group events.