GUYS HELP ME: 10 POINTS AWARDED. 1st date...2 days later he's on vacay, sms on the plane "speak soon, have have a good w

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Had a great first date with him after speaking for a month and a bit...he was very sweet and told me he felt so comfortable around me..we kissed also. I text afterwards saying it would be nice to see him again and he told me to hit him up when I'm next in his area. He went on holiday 2 days later, we sms'd inbetween. I text him the night before saying have a good time, speak soon, bye etc and expected no reply, but he sms'd me on the plane right before flying saying speak soon have a good week xx. He went offline but then reappeared 2 days after arriving and I haven't heard from him but I didn't reply to his last message...Am I being paranoid? what do I do? Is he playing it cool and not wanting to look too clingy? I want to sms him but I don't know if it's wise..HELP please