<human>: I've been dating this guy for a little bit of time, around 6 months. We liked each other a lot and got along swimmingly for the most part. He repeatedly told me he didn't want to rush into a relationship because he made that mistake once, so that was understandable. 

We got into an argument a couple of days ago which resulted with me ending things with him for good. Since he thought it was over, he sent me a detailed messaged about how he's in love with a girl he's never met and has been talking to for 3 years. Yeah, my life sucks. But anyways, says he never once led me on despite the fact he told me he wanted to have kids with me, would propose next year and all of this other creative bs. I put 2 + 2 together and realized he would propose and impregnate me next year if the LDR didn't work out. That doesn't hurt too much, can't compare a 6 month relationship to a 3 year one. 

But, he continues to text me even when I don't respond him. He invited me over to his house the same day I found out about his mail to order bride, she's not really one but seriously why haven't you met someone you've been talking to for 3 years. I have no clue who this girl is but I would like to tell her before she moves 3000/4000 miles away to some guy that is scum, IF she does. She's backed out several times apparently and she probably has a boyfriend where she lives but that's his problem, not mine. Should I just go about my life and not tell her?

Give me a shortened version of the text
<bot>: guy i was with for 6 months has been talking to a girl he's never met for 3 year and plans on marrying her. What do I do?