I'm a huge people pleaser myself and find it so difficult to put myself first in situations like this without feeling guilt.
When I notice that I overthink and worry too much, I try to think of the best possible reason why things are like they are and stick to this until I find out. Cause then I don't have to worry for now and often things are not as bad as they seem and then everything's fine. If it turns out that the real reason was worse than what I expected, I'll still have enough time to worry, later.
So in your case it could be that your friend was a bit surprised by your confession and needs some time to process it first. Maybe he wants to talk about it to you but wants to think about it / inform about it first.
Or maybe he just has no clue how to handle it and it makes him uncomfortable and therefore the silence. That wouldn't make him a very good friend or very mature but it's understandable. And it's still no bad intentions.