In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
1- If you have had a love affair with a woman, then she got married to someone else, it is time for you to forget it and move on with your life.
2- If a woman is married to someone in this world, she would remain his wife if she dies while still married to that person – provided they both go to Paradise.
In responding to your question, Sheikh Ahmad Kutty, a senior lecturer and an Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states:
Marriage in Paradise
If you have had a love affair with a woman and then she got married to someone else, it is time for you to forget it and move on with your life.
In life, you cannot expect to get everything you wished. Islam teaches us that it is wrong for you to covet someone’s wife. The fact that you loved her in the past does not make it lawful for you to continue to cherish that love once she has been married to someone else.
Even as she is someone’s wife in this world, she would remain his wife if she dies while still married to that person – provided they both go to paradise. It would be, again, wrong on your part to be married to her in Jannah.
I would advise you to seek counselling and break your mind free of this infatuation and addiction. I think it is not healthy for you emotionally or spiritually.
You should say this duaa:
O Allah, make me cherish faith and embellish my heart with it and make me hate disbelief, transgressions, and acts of disobedience.
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Lastly, it would be better for us to focus on actions that would bring us close to Jannah and turn us away from all the things that may lead us to hellfire. In Jannah, we will experience such abiding bliss like no eyes have ever seen, no ears have heard about, and no mind could ever imagine. So, let us pray to Allah to bestow on us that supreme honor.
Almighty Allah knows best.