It could be sexual inexperience, he could be shy and know what to do next, he could be exceptionally busy, or any other possibility your imagination can make up.

Usually though when one’s imagination takes over, it produces some pretty elaborate scenarios, that tend to blame oneself or think of extreme possibilities.

However he’s doing a pretty poor job of communicating. Imo if someone is into you, even if they are busy, they’ll make time for you. If he was a consistently poor texter, then I’d think differently. But his behavior has changed.

They sound like excuses for avoiding the conversation to me. Why that might be, we have no idea. But it’s fair to ask why.

Sure you don’t want to come off clingy but also you need to respect your feelings and time too. I would say something like, “Hey I know you’ve been busy, but I feel like you’ve kind of been distant ever since the last time we hung out. Is everything ok?”