I sent him a cute text and he ignored it.

Me and my ex are sort of getting back together (he thinks we're dating again) and on Thursday we had an amazing time together and he was extremely sweet - he wasn't faking it either. I sent him "I'm happy Thursday happened :)" And he never said anything back. What the hell? Should I just ask him about it in person when I see him Tuesday or should I text him again and ask him what's up?
I sent him a cute text and he ignored it.
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