He reads my message but doesn't reply?

So me and my fiancé are long distance because of the visus situation going on right now. And we have not really had any problems in our relationship however I noticed more and more lately he will read my message or watch my video and then not reply. Until way way way later. Lime right before he goes to bed. I think it is a little weird and I don't know if it is just from him being busy or if he is just annoyed or tired or I don't really know but does anyone else have that happen to them? We usually talk on the phone once a day and it seems like when he doesn't want to talk he will read the message and reply back really late and say he is going to bed. 🤔 I do t think he is doing soemrhing he shouldn't be doing but I just think it's weird. I dont know maybe I just need advice to keep spark in a LDR too.😭

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