<human>: My best friend from college just moved from out of state to my city because he got a good job offer here making $60k/year.

He's been married once before and is divorced (she cheated, had a kid, and lied to him saying the kid was his. He did a DNA test, found out the truth, and divorced her). 

He started dating this new girl (age 33) 7 months ago, and she has 2 daughters (14 and 12). In their state she had a nursing job. When he got the new job offer, he had 3 weeks to move. He was telling me that he was going to breakup with his gf and let it fizzle out. Well turns out that was a lie or mistruth, because after he lives here for 2 weeks alone, he tells me that his gf and kids are moving in the next day. They have 4 people living in his 2 bed/2 bath now.

I think it's crazy how fast he's moving with this girl and I've told him, but he won't hear it. In my mind he's blinded by "love". She has no job here and has to take some tests to get a nursing job since this state's more strict, so it might be 4-6 months before she has a job, and he's supporting them until then.

The 2 weeks he was living here "single" I would see him almost every day to play video games/hangout. Now that she's moved here, I've seen him for 1 hour in the last week. Now he's trying to get me to come to his apartment and meet the girlfriend and daughters, but I'd rather not. What should I do? Is there anything I can say to make him realize he's making a mistake, or am I just being incredibly selfish?

Can you give me the gist of the text in a nutshell?
<bot>: Best friend moved to my state, brought his gf of 6 months and 2 teenage daughters with her. I'm not happy with the situation. How can I make him realize he's making a mistake?