I need advice

I was dating this guy for 2 years and we had plans to go together to California on July the 14th and get married but 3 days ago I found out that he was talking to another girl I feel broke im not even crying tears just fall down my face I have no one to talk 2 I wish that I could have a friend i really want to tell my mom but if I tell her she will force me to go back to my country bc I'm not from USA I dk what should I do .. every day he tells me that he's sorry that he will give me space if we go together to California but I dk should I go with him and know that he was flirting with another girl or should I just go back to my country and forget about him .. I'm really hurting and I don't have enough time to decide i have only a month please give me some advice