Should I not text him back?

LDR of 6 months... he used to text me 24/7 & then we went on a month long hiatus. After that he basically spilled his heart out & told me he cared a lot for me, etc. I told him i did too but LDR is difficult & not attainable for us & we both knew that. We agreed to just go with the flow & be friends. Everything's been fine but the last 2 weeks he barely texts me all day or he'll just text me goodnight at like 11pm after like 2 texts all day... weve talked on the phone 2x in these weeks for like an hour plus which is nice... but I don't know I miss him a lot.. even though we supposed to be friends but still... my question is when he does text should I just not text back all day too... instead of replying to him minutes later..
Should I not text him back?
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