My best friends fiance said he needed space?

My best friends (30f) fiancee (37m), they have been together for 3 years. He told her he needed space. I don't know how to make her feel better she's freaking out! Men please help me gain some insight to what he might be thinking? They were great just last week and he was saying how he wanted her to tell her dad about the engagement. In our culture elders are sent to the women's house so that parents can approve. Everything is planned. Everything was great. They were planning a future. He bought the ring. Now he says he " needs space to think about their future together and will let her know". I know him he was excited. What could be going through his mind?

My best friends fiance said he needed space?
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