AITAH for not giving someone money because they still haven't paid me back?

So, I have a friend, "Mark" who has asked to borrow money from me a few times in the past The thing is, every single time, he has never paid it back, and I've had to remind him multiple times It’s not huge amounts, but it adds up, and I’ve given him the benefit of the doubt every time

Now, out of nowhere, Mark reached out saying he's dealing with an “intense problem” and has a financial emergency He says he needs money urgently and asked if I could help him out again The problem is, he still hasn't paid me back from the last few times, and he’s never given me any solid reason why he hasn't

I told him I couldn't lend him money right now because he still owes me, and honestly, I’m feeling a bit taken advantage of I told him that until he can pay me back what he owes, I can’t really offer any more help He got really upset and said I don’t understand what he’s going through, that this is an emergency, and that I should “be a good friend”

I get that he’s having a rough time, but I’ve been in situations where I’ve had to stretch my own finances and manage on my own And I’ve helped him out in the past, so I don’t know… I’m just feeling a little burnt out from constantly being the one to help without getting anything back

My other friends are divided on this, some say I’m in the right to stand my ground, but others think I should just help because he really needs it

AITA for not helping him this time?