<human>: So I always have been really anal about texting etiquette and my BF loves to read-and-no-reply, read-but-reply-hours later. We've had frequent bickers/fights over it before, and i have been trying my best to accept this is the way he is because he's really not a 'phone-person'. 

So it still happened a few times and on Thursday night we were texting/chatting about something when he suddenly disappeared again. read and no reply. At that moment i just felt heat rising, possibly due to a few accumulation of similar incidents the past few weeks and i kept quiet about it. 

I didn't want to kick a fuss but neither do i want to just let it go like this because he might take it for granted and just continue doing it in future, so i texted him like i dont understand why i always end up talking to a wall in the middle of a conversation.

Apparently he sounded fed and said he's busy and living with many other people and he 'message me when he's not busy'. 
I'm so offended by this, like hello, i text you even if i'm busy! I'm not some convenient person for you okay.

So i replied saying oh yea you're very busy and i'm very free i should be very happy that you're even texting me right? my fault for expecting too much again. 

Since then we haven't spoken and i don't know what to do now. Its hard for me to change my idea of proper texting (isn't it basic courtesy to reply in a conversation that has not ended?!). I don't want to give in but neither do i want this to blow up into something bigger. please give me some advise thank you.

Could you distill the essence of the text into 1-3 sentences?
<bot>: BF always leaves conversation midway and makes me really angry, i'm anal about texting etiquette. I expressed unhappiness and we haven't talked since thursday.