How to be normal around the person who you like?

There's a guy at my class who I had always found quite attractive (personality, appearance every way). It's not been a long time so I it was limited to that. We never talked. Now recently our professor gave us a group project and each group consists of 4 people. He is in my group as well. Now the issue is that the two other people apart from us are dating each other. So while doing our data collection, the group will be split into half, and as the couple will be together, I've to be with him. He talks to me a lot these days and I feel so awkward to talk back. The couple once kind of jokingly suggested that we could date each other as well and he laughed. I never took my admiration for him seriously, but this is getting more and more uncomfortable. We've to spend whole six months together. How do I get over the crush and act normal? I'm a quite shy person, went to mostly women-only institutions, never have had much interaction with the opposite sex except an online relationship once that ended long ago.

How to be normal around the person who you like?
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