Fear of mentor

I have a mentor who seems to not like if they feel someone is in competition with them. They have mentioned a number of times how people have taken from them.
When I was less successful they seemed to like me and encourage me doing well. Now that I’ve been a tad bit more successful, they seem irritable with me.
I feel afraid to fall from grace with this person who has been a mentor for so many years.
I dont know what to do – feel froze and afraid.