Dating a guy with a pregnant ex?

So recently me and this guy started dating and he was very upfront about everything. He made it clear they were over. Our relationship is beyond awesome. However now that his ex is around 8months pregnant she keeps calling/texting him like he's her bf to bring her things. He showed me the text and we deleted it. He said if she's not in labor he has no reason to go by her home or to take her things she's craving ( she texted asking if he could bring her a mcflurry the other day because she doesn't have a car).  All of my friends think it's a bad ideal getting involved with a guy with a kid on the way. Opinions?