@karni,
karni wrote: Now i am in some kind of relationship with my ex
what should you do?
start by sitting down - in person - with your ex - and talking to her about what she sees in the future. be honest. let her know that you are currently in a relationship with someone else.
you also need to let the other woman know that you want to rekindle your relationship with your ex.
let them both decide what they want to do next.
if the woman who is coming to your country for her internship is still planning to come, it seems that you will be responsible for arranging and paying for her accommodation.
it would be truly unkind of you not to be honest with both of them.
neither of them is in an honest relationship right now.