All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If the case is as you mentioned that your family lied to you when they told you that your wife and her family wanted Khul’, then they were very wrong, so they must sincerely repent to Allah.
There is no doubt that Allah is Omnipotent and everything is very easy for Him. Allah Says (what means): {Indeed, Our word to a thing when We intend it is but that We say to it, "Be," and it is.} [Quran 16:40]
So He is able to turn hatred into love. Allah Says (what means): {Perhaps Allah will put, between you and those to whom you have been enemies among them, affection. And Allah is competent, and Allah is Forgiving and Merciful.} [Quran 60:7]
Hence, we recommend you to earnestly supplicate Allah and ask Him to reconcile between you and your wife and to reunite the family.
The fact that the matter is decreed since eternity does not, Islamically, prevent to supplicate, because even supplication is predestined. A Muslim repels Decree by means of another Decree. Thawbaan, may Allah be pleased with him, narrated that the Prophet said: “Nothing repels the Divine decree except supplication.” [Ibn Maajah]
The fact that there is no love between the spouses does not necessarily mean that the family must split and for the bond of marriage to end. There are many benefits that require that the family stays together. If there is nothing else except this girl that Allah blessed you with and that binds both of you, then it is enough. ‘Umar said: “Homes are not only established on love.”
There is a difference of opinion among the scholars about the meaning of the Hadeeth referred to by your ex-wife. In any case, it (the Hadeeth) does not prevent the spouses from returning to each for the benefit even if there is some hatred.
Finally, it should be noted that one should be polite when speaking about Allah; so it is not appropriate to say such a phrase about Allah, we mean your saying: ‘Can't Allah…..’
For more benefit, please refer to Fatwa 295609 and 86796.
Allah knows best.