Hi, i got into trouble i guess, and dont know what to do. please i would greatly appreciate any thought/advice.

History:
there's this guy from another country i met online in 2001. i slowly fell in love with him and after a while, i told him. he didnt feel the same at first but then after a while he said he fell in love with me too and we started fantasizing about getting together (this all happened in a few years). talking about love with him was easy because we were so far away and because our relationship has always been more about fantasy than reality: we could go on for months without speaking to each other in any form (calls, missed calls, emails, chat, texts), then exchange a text or two saying how much we loved each other and we wished we were closer, and then again not hearing from each other for months. except for the first year we met, where we were emailing eachother daily, the rest of our relationship has been like this. talking a bit for a couple of times a year.

in 2011 he flew to my country and we met in person for the first time. he stayed a couple of days. nothing romantic happened, not even a kiss, even if we both confessed to each other later that we did think about it. after he got back to his country everything got back to normal, and we restarted hearing from each other casually a couple of times a year. sometimes it was him disappearing, sometimes it was me not answering to him.

this year though, thanks to whatsup, we got back in touch and got to talk a little more. we talked about living together, getting married, having kids... but it was all a fantasy/game for me. one part of me really does love him, the other part thinks he is crazy, he is unreliable and too touchy. not to mention we still live in different countries and we barely actually speak to each other. before this spring, i didnt even know he was living on his own or where...

Now:
last month, after he texted me and came back in my life after 4 months of being missing, i told him i loved him but didnt like him disappearing like that, for so long and without explanations. after that, every once in a while he texted me, called me and made missed calls but i never answered again. i completely ignored him because i was offended he left me wondering whether he was even alive or not, and this morning i got a text where he said he talked with his family that we want to get married and they said they are happy about it and they love me too.

this doesnt seem a game/joke anymore. it seems serious to me, he told his family. my family has met him when he came to my country and they like him, but i never told them we were fantasizing about getting married. it was more a fantasy than reality to me, even though there have been times i did seriously consider it. but we never even kissed. isnt this crazy?

what do i do? i am tempted to say while he was gone i got a new bf, but a part of me doesnt want to lose him... not that he's that present in my life but... what if it could really work with him? i think he is crazy, it is all in his mind and fantasies, he doesnt really love me because he barely knows me anymore and the same goes for me about him, but after all these years he does know me more than most people, he knows my past, my secrets, my problems...what if it could really work and im throwing it away out of fear? not that i got many other chances with other guys, you know... actually im feeling quite hopeless in that field. i am 32. Single, lonely. what if this is my only chance?

what do you think? what should i do, say or even think and feel? im so confused!

Thanks for any help!