My ex is ignoring my texts...why?

My ex and I chat everyday but also send texts to each other on a daily basis. There are times though, when he ignores my texts. I sent him one last night and it was a nice one and I did ask him how he was and what he was up too, as it is usually what he asks me, but I heard nothing back from him. The other night he did the same thing, ignored my texts. He expects me tell him everything that's going on in my life and yet I cannot do the same with him?! It feels to me like he has more rights to know about me than I have about him. Sometimes it is an effort to keep the conversation going when we chat online, I seem to do most of the talking.

When we were together, there was never a problem communicating, he would always respond to my texts and always be chatty online and now its like he is on a different planet and conversation is intermittent.

How do I get him to stop ignoring my texts?
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Thank you for your replies. Much appreciated. He did text me later this afternoon and said he was mowing the lawn, clipping the hedge and having an ice cream, he sent some smileys after that and then asked me how I was. I have not replied to him.
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I don't think I will do so, I think I will let him stew for a while. But honestly I don't like having to do this kind of thing. I just want it to be normal
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I have still not replied to him. He has not text me, even out of curiosity or care, just that one he sent in the later afternoon yesterday. I think I might send him a text later today. Normally I go online to a messenger and he sees me there
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(he always appears offline) and he says hello to me and chats for a bit, sometimes for an hour we chat or less but he usually has to go out or do something so he goes. I am trying now to go before he does. Yesterday, I didn't go online to messenger
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I am not going online to messenger today.either
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Ok I texted him about 15 minutes ago. Nothing back as yet.
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Oh just to add, I won't be going online to messenger, as that will make him avoid having to text me!
My ex is ignoring my texts...why?
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