Guys, should I text this guy one last time or just let it go?

We met a week ago and hit it off real well. Made plans to hang out again, etc. He was definitley interested - now he's suddenly stopped texting me so much. I invited him out to join me and our group of friends two nights ago, and he didn't reply until the next morning saying "Hey sorry I wasn't feeling too good last night." I replied a few hours later "That's okay, are you feeling better?" and no response. Should I just let it go, or should I text him something like "Hey no hard feelings, but did you lose interest?" It's not the rejection part that bothers me, it's the uncertainty. If he doesn't want to talk anymore than okay. I would just like to know. Is there a way for me to ask that?
Guys, should I text this guy one last time or just let it go?
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