How can you tell if a guy is really interested in you and wants a relationship?

I started talking to a guy long distance couple of months ago. In the beginning he liked a lot of my Facebook posts, but immediately after we met in person (about a month in. It's been about 7 weeks since we met in person) he stopped liking my posts. However, I've noticed he likes a lot of other people's stuff. And he calls me and texts me every single day, even if it's just to share a small detail of his day. He also seems a bit distant in our conversations and doesn't tease me like he used to. But he still continues to call EVERY day, sometimes multiple times a day. If a guy is losing interest would he continue to call every single day?

How can you tell if a guy is really interested in you and wants a relationship?
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