Hey ahdm this is a difficult situation to be in, and I understand the confusion, because if I were in shoes, I'm not sure if I would necessarily know what the best decision would be... but because he's seen your messages, I think that right now, you should give him some space. He might be dealing with some things, and for some reason he's not in the position to message you back. But the fact that he knows that you have messaged him is important, so that he knows that you care about him, and continue to think about whether or not he's okay. I think maybe not texting him for about a week is a good idea, and then maybe message him no more than once a week after that. That way, you won't be too clingy and suffocating him with your messages, and also that he always knows that you're thinking about him; so if he's ever considering responding to your messages, he won't lose hope that he's lost your friendship, or anything of the sort. I hope that this advice has really helped - I wish i could do more keep hanging in there