Friend isn’t texting back?

I overthink A LOT, especially when it comes to friends. I’ve known this friend since I started college in 2014. After college, we’d hang out every 3 months. We recently hung out in February, and than again a few weeks later. Than we went to go get boba with other friends 2 weeks ago. I texted him last week if he wanted to go get food but he said not that weekend, but this weekend. So I texted him last night to see if he wanted to hang this week but he hasn’t replied. I texted him again like 6 hours ago today telling him what my other friend said but still nothing. I know he’s still in school, working, and has a new gf. I also know he takes a while to respond back. Sometimes 1-2 days. It just gets me anxious as to why he hasn’t texted back, and I don’t know what to do next?