Why is my male cousin ignoring me suddenly?

My cousin is five years older than me. When we were kids, we loved each other so much. But, last 15 years, they moved to other town. About 6 months ago, we got to meet again and we still love and close as usual. But, he starts to ignore me and avoid me from last month. I don't know why. We used to faught but we sticked together all the time. Once he told me that we will never lose contact again. But now, what he doing is different. What can it be?
Why is my male cousin ignoring me suddenly?
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