There is nothing wrong with you. I can't have casual sexual encounters either. I need to feel a connection with someone too.
Will your 1st BF come back to your country? Can you visit himwhere he is? if you too are really that close, maybe you should get married.
If not, maybe you should start dating again and try to get some feelings for another man again. Once you've found a worthy man, you can share some intimacy but just tell him no sex before marriage. If you do nearly everything else, he should be ok with that. Maybe you could find a male friend who is ok with no sex, but just hugging and kissing, just so you get some intimacy.
You need to learn how to and be comfortable with masturbation. It is totally safe, normal, and natural. That will help you with your horniness. Any you need to do it naked, fully, until you achieve an orgasm. Buy some sex toys if you can. They will help. Can you carry on a long-distance relationship romance with your 1st BF and just see him occasionally? maybe you could make that work.
Or maybe you could go ona dating website and try to meet a man that way. You never know, you could find someone really nice on there. You could have an internet BF. You could forma abond with him and practise cyber-sex with him. That can work.
I don't know what else to suggest. I think you should find a new man, someone you can learn to trust and like, enough to do sexual stuff with. Good luck. Keep me posted.