Guys, Am I overthinking?

My ex and I have been seeing each other again and he told me he "wants to get back together but take it slow" it seems to be more serious lately, we hung out 5 times last week and he's been making a lot of effort to text me (he's a bad texted normally which I know from living with him beforehand) He wasn't feeling well last time we hung out so the next day after I left his house I texted him to check on how he was feeling, he hasn't replied and it's only been 2 days but I'm a terrible overthinker. I'm getting green flags all round but I'm not sure if he's just tired, wanting some space, or just not interested/friendzoning me. I highly doubt he is friendzoning me based of the way he talks and behaves towards me.. very flirty. However I would like to hear from a guys perspective. Thank you!

Sorry for the absolute paragraph!

Guys, Am I overthinking?
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