Pls help me - Male Cancer disappearing act

Yet another gal asking for help about Male Cancerian disappearing act Sad
Quick version of story: we dated 7 mos, then he disappeared 3mos after I asked him to let me go if I'm not the one for him. Then, he came back to see me just before he moved back home to his family in Europe.
Since he's been back home, we've been talking just about every week, for hours. I shared the truth about my feelings for him 1month ago (this is after us being 'together' for 1year 3months, though a lot of that time apart).. that he's the only man I ever wanted to have children with. He said he wanted me to be the mother of our children & that he wanted to spend the rest of his life w/ me.
On his instigation, we started working on tasks for him to return to America (he's a Citizen). Things started moving fast when he received job offers requiring him to come to America in 1month. He admitted he was feeling scared. And I had a feeling that it was too fast & soon for him. He told me that he told his family that he was returning to America.. & they're all upset at him. After that, I saw indications that, although he has not said it, he's changed his mind about coming back (so soon). Note: he does have firm plans to visit in Summer.
Since then: he arranged for us to talk, he stood me up. He apologised & arranged for us to talk again. 10 minutes before THAT phone date, he cancelled, then arranged to talk another time. I called just-because, on a different date & he was pleased & then told me he'd EMAIL me the next day (wth?). On the date of the Arranged Talk again, he stood me up again. I emailed him & asked him to help me understand why this keeps happening.
I have not heard from him since. It's been 1 week since he stood me up the last time. Over 2 weeks since we last talked & since I could sense that he has changed his mind about coming back (so soon/at all). Valentine's came.. he thanked me for what I sent him.. but I did not even get a "Happy Valentine's" or "I love you"
What do I do?! Do I contact him?! Do I leave him alone? I haven't contacted him after email & I'm scared if I don't contact him he'll disappear forever...& I'd blame myself.
Question: Once a Cancerian Male tells you that he wants you to be the mother of his children, that he wants to spend the rest of his life with you... do they just bail on you and move on?
Male Cancerians - I'd LOVE YOUR HELP in particular!