He apologized for not texting me for a week (said he was really busy), but did he actually loose interest?

localoca
I've been dating this guy for a month. We used to see each other once a week and text every day (always at his initiative). All of our dates were great, we made out a lot, had nice conversations... But the last one was kind of weird. We were actually both tired, I felt like he was not as entusiastic as he used to (even by the way he kissed me) and neither was I.
A whole week passed without any news so I texted to say hi.. He replied immediately, seemed very cool and said "BTW, I'm sorry for not giving news this week, I was very busy".
I said there was no problem.
I wonder why he would apologize if he was actually trying to withdaw?
GUYS, would you do that?
THANK YOU FOR YOU ANSWER :)
He apologized for not texting me for a week (said he was really busy), but did he actually loose interest?
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