If you're having a good conversation with the opposite sex throughout the week and then all of a sudden they become distant would you be concerned?

It's a long distance relationship we were having great conversations during the week but come last Friday all of a sudden he becomes noticeably distant and today (Saturday) has not sent one text. Earlier in the week he was all gunho for chatting on the phone but today barely acknowledged my comment about chatting

Yes definite cause for concern
Maybe cause for concern
Not a cause for concern
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*this Friday
If you're having a good conversation with the opposite sex throughout the week and then all of a sudden they become distant would you be concerned?
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