Maybe he just doesn’t know how to respond to this so give him some time before talking to him again if you may? I do know some people see this as their privacy so you reaching out may be a sign of you crossing the line. But whatever the reason is, wait patiently, maybe a day or two before reaching out to him again. If he responds then you two can conversation about this. If he doesn’t, or he explicitly suggests you two should never contact again, moving on won’t be a bad idea as well. I know it’s hard, but if he sees the fact you offering help as an offense, it’s hard to change his mind. There’re other fish in the sea though.