Jesus said that there is a place where the cursed, the Devil and his angels would be ‘cast ‘into everlasting fire…’ Doesn’t this prove Hell is forever?

No, because the word everlasting does not mean ‘for all time to come’, but ‘for the duration’. Fire burns until its fuel is burnt up.

​According to Ezekiel 28 the Devil is to die the death and be no more.
He’s the archenemy, but certainly not the equal to God. God controls everything. All the cursed, the Devil’s angels and Satan will all cease to exist; they will not be tortured for all time to come, if we trust that God knows better than us. Read his word on it and trust his word; not that of mere men.

​Notice Ezekiel 28:11-19: Verse 11 ‘Moreover the word of the LORD came unto me, saying, 12 Son of man, take up a lamentation upon the king of Tyrus, and say unto him, Thus says the Lord GOD; ‘You seal up the sum, full of wisdom, and perfect in beauty.

​13 You have been in Eden the garden of God; every precious stone was your covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of your tabrets and of your pipes was prepared in you in the day that you were created.

​14 You are the anointed cherub that covers; and I have set you so: you were upon the holy mountain of God; you have walked up and down in the midst of the stones of fire.
15 You were perfect in your ways from the day that you were created, till iniquity was found in you.

​16 By the multitude of your merchandise they have filled the midst of you with violence, and you have sinned: therefore I will cast you as profane out of the mountain of God: and I will destroy you, O covering cherub, from the midst of the stones of fire.

​17 Your heart was lifted up because of your beauty; you have corrupted your wisdom by reason of your brightness: I will cast you to the ground; I will lay you before kings, that they may behold you.

​18 You have defiled your sanctuaries by the multitude of your iniquities, by the iniquity of your traffic; therefore will I bring forth a fire from the midst of you, it shall devour you, and I will bring you to ashes upon the earth in the sight of all them that behold you.

19 All they that know you among the people shall be astonished at you: you shall be a terror, and never shall you be any more.’
The only question then remains: Will you believe God or men?