Sexual tension?

I'm having a few little issues within my relationship with my boyfriend. He's going to be gone for a few weeks soon. He mentioned sexual tension yesterday, saying that this vacation could be good because it could relieve some of the sexual tension within our relationship. The problem is I don't feel any sexual tension (I mean more so than the average teenage hormones type tension). Every time I see him he's kissing me/my neck, hugging me etc. It's not me that initiates anything right now because he's leaving soon.

I don't know how to deal with this because he doesn't want to be alone with me right now. Usually we're fine but lately he seems a little on edge and craving sex. We plan to wait for sex though. Pretty much, what is a way to relieve sexual tension? Without sex? ANY suggestions are accepted, just please help me.