Why isn't he texting back?

So I recently hung out with this guy( if you read my previous question you will get a more in depth understanding of the matter at hand) and he seemed to have a really good time with me, or at least that’s what it seemed like. We hung out a few times before, but it was mainly for him to tutor me or just a quick walk to get ice cream, etc.

From my texting experiences with him, I can tell he isn’t much of a texter and he usually only would text me first if it had to do with tutoring. However, I really wanted to just make a friendship with him after tutoring had ended. So I invited him places and we just hung out about a week ago. However, I don’t want to make him uncomfortable or put him in a situation where he feels awkward, so I try not to ask him to hang out too much.

I waited a week to text him again to hang out, which I thought wasn’t too early to ask again and he never answered me back. All I did was ask him if he wanted to come to my birthday dinner. I decided to leave it at that and not let it bother me. However, my friend basically insisted I just text him hey the day after the birthday text, which I did and I regret it because I feel creepy.

Well he never responded to that either and that was 3 days ago. I know there is a list of possibilities other than the fact that he is ignoring me, but I just feel upset about it. He seemed to have a lot of fun when he was with me and I really enjoyed his company. I don’t really have any friends at all and I’m super lonely, so it was wonderful to have someone like him to spend my time with.

I just don’t understand what I’ve done wrong. I’ve done my best to not be assertive or “needy” I suppose and making friends is just so hard for me because they always go away after awhile. Does anyone have any ideas on what I can do? Or why he isn’t answering?