Ex long-term boyfriend drama?

(By long term I mean a year)
What should I do if my ex long-term boyfriend, 4 months after he broke up with me, ruined my chances of getting with someone new.
Now, months later, I'm getting to know a new guy that my ex boyfriend really looked up to as a friend. This guy really likes me and I want to like him but I'm scared it will be ruined by my ex again?
Should I tell my ex boyfriend ahead of time so he isn't as hurt? Or should I just warn my new guy since they're friends?
Any advice is welcome ❤️
Ex long-term boyfriend drama?
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