Kiss them and see what they do
He likes you for sure
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When he is sure he likes her.
To be sure whether or not a guy likes you, you could always just ask. If not, have a conversation with him, ask him if he wants to hang out with you.
the only way to be really sure is to ask him
Not sure how you expect someone to magically know something.
ask him
Make sure you both like each other. If one of you don't like the other then it could work out badly. But if you are really sure that this guy likes you and your ready to commit, go for it!
Ask him.
He tells you, frequently and with enthusiasm.
Have friend find out if he likes you. If so, just ask.
Do you like him? If he likes you, you'll know. If you can't tell, then he probably isn't that into you.