Can I visit a former professor during office hours?

Are you still being bullied at your current school? Why aren’t you discussing your academic plan with the advisor there? Your former professor isn’t being paid to understand the requirements at your new school and may be reluctant to take on that responsibity. Stopping in to say hi is different than asking him to take on advising responsibilities for you.

If you enjoy your former school more, is there a chance you could transfer back? You wouldn’t be the first student to decide their first school was a better fit for them.