Praise be to Allah.
First of all, I'd like to congratulate you, sister, for being serious about Allah's Deen, praying 5 times a day and following the Sunnah of the Prophet (SAWS) to ward off evil by reciting Ayatul Kursi, Suraah Falaq wa Naas before going to sleep. It is very good that you're concerned about such a serious issue and didn't hesitate to ask a question regarding this. May Allah give you excellent reward for this and alleviate your sufferings and troubles as soon as possible. Ameen.
But, I'd also like to remind you, as a fellow Muslim, that it's not permissible for a female to get involved in an extra-marital/pre-marital relationship with a non-mahram male. May Allah make it easier for you to stay away from such relationships and get married as soon as possible. Ameen.
With regards to the situation you described, you must first be absolutely sure whether the things that are happening to you are really supernatural stuff i.e. a Jinn is indeed involved in it, or is it a human being, posing as a Jinn, and, Astaghfirullah he is violating you, Allah forbid. But if you're sure that it's a Jinn, it is very likely that this Jinn is an evil Jinn, and you should try your best to ward him off. You should not even consider getting married to him. Contact a qualified Shaykh who performs 'Ruqya' and highly skilled at exorcism according to Qur'an and Sunnah. Tell him everything and ask him for help. And above all, make a lot of du'a to Allah Subhanahu wa Ta'ala for getting you out of these bad events.
With regards to your question whether a Jinn can take a person as wife/husband, it can be answered from two perspectives:
- Whether it is possible for a human being to get married to a Jinn
- Whether it is permissible for a human being to get married to a Jinn
Perspective - 1: It is extremely rare, but not impossible.
Perspective - 2: Majority of the classical scholars from all school of thought, especially scholars from the Hanafi, Shafi'i and Hambali school of thought have stated that such a marriage is not permissible. Only Imam Malik didn't directly oppose such a marriage, but he stated his dislike for these type of marriage and hence, according to the Maliki School of Thought, it is considered as Makrooh. Among the scholars from the Hanafi school of thought the most notable are Qadhi Badr al-Din al-Shibli al-Hanafi and 'Allama Ibn Abidin Al Shaami who said it's not permissible. Among the scholars from the Shafi'i school of thought was Imam Jalaluddin Suyooti and Imam Khatib al-Shirbini. For more information, please refer to this link
Summary : Sister, you should try your best to stay away from being involved in any sorts of extra-marital relationship and instead, try to get married soon. Contact good sisters so that they may help you find a nice and religiously committed Muslim guy to get married to. Ask Allah's help to get married soon, He won't disappoint you. You must ensure that the encounters you faced is not a human affair and it was indeed a supernatural event. If that is so, you should make no delay and contact a qualified Shaykh who do Ruqya and Exorcism and is skillful. It is possible to get married to Jinns but classical scholars of almost all Schools of Thoughts have given Fatwa that it's not permissible,except Imam Malik. Even if it were permissible, it can only be done to Muslim and good Jinns, and not to evil and Kaafir Jinns. Based on your description, it seems the Jinn who's bothering you is an evil Jinn and most likely to be Kaafir. So you can't marry him.
And Allah knows Best, and He is the source of all Strength.