So there's this guy

So my girlfriend was trying to "set up" one of her friends with a guy. The same night she mentioned it she invited him over to her house and I was already there. We've hung out every night but one since. That was over a week ago. So when this "set up" comes over last night she knew why she was there. I pulled her aside and let her know I was feeling the guy (nicely of course) and she said she wasn't there to be with anyone but just to hang out (obviously, you just met him an hour ago). Well in driving her home last night I find out she JUST had a baby 14 DAYS ago, she's married, she's 24 and the baby's not her husbands. Then let's my girlfriend know that he texted her last night talking about how cute she is. I did try texting/calling him to see if he wanted to come hangout after we left girlfriends place and he didn't respond. 
I don't know if I should just walk away since its only been about 10 days we've been hanging out and let him get his heartbroken by yet another fast and lose girl or if I should stick it out because he'll come to his sense and see what she's really about. Him and I have hung out for hours at a time and have good convo. We're actually suppose to hang out today and go to the beach without the "set up" coming along (she needs to be home with her newborn not out chasing boys until 5:30 am -how late we all hung out). In all honesty the girlfriend who tried doing the "set up" is his sisters BFF so I think he values her opinion on a girl she'd want him to meet. I'm just so confused. Maybe somebody from the outside looking in can help a bit!?

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