Well, if the Lord casts someone into everlasting (unquenchable) fire, who is to say that the person cast in, is everlasting or eternal also? Author John R. Stott makes a great point on this:
"...it would seem strange...if people who are said to suffer destruction are in fact not destroyed...it is difficult to imagine a perpetually inconclusive process of perishing."
(J. Stott and D. Edwards, Essentials: A Liberal-Evangelical Dialogue, London: Hodder & Stoughton, 1988, page 316).
For example: The wild fires that took place in California almost seem like they are unquenchable. In fact, a fire can be unquenchable if someone actively keeps it going. However, that does not mean that what is cast into that unquenchable fire is going to last forever. Real life shows us that fire eventually destroys, or causes things to perish or to die or to turn things into ashes. Which are words that are used in relation to the destruction of the wicked.
In addition, then there is the moral issue, as well. Would you approve of your government torturing people for their entire lives for those who were clearly convicted of crimes that were exceptionally wrong? You know, clear evidence that they committed the crime. What then? Should we not follow God's example and torture people for their entire lives just as God tortures people for their supposedly everlasting life? Don't we punish people according to their crimes they committed here? Does not the punishment fit the crime? Is that not just and fair the way we do things? How can God being more loving and just than man do any less?
I mean, I get it. I used to believe in Eternal Torment and defend it, too. I thought to myself that this is what the majority of evangelical churches believe, so it must be true. But I decided to dig deeper within God's Word because of the moral issue that kept coming back to me.
Anyways, pray about it and seek the Scriptures for yourself, my friend.
I hope the Lord will guide you into the truth on the topic as He has done for me.
In any event, God bless you.
And please be well.