I'm a Muslim.
Really he shouldn't have been dating you or anyone but people can't help falling in love so for him to marry you, you would have to become a Muslim yes. But Islam does not force itself on anyone. You can only become a Muslim if you truly believe from your heart. Don't convert for his heart, convert because your heart accepts Islam.
If you have any questions message me but I don't want to make my post long.
In essence Islam is about worshipping One God, who has no partner, no father, no son or daughter or wife.
With belief in God comes belief in all the Messengers, from Adam to Noah to Jesus to the last Messenger Muhammad, peace be upon them all.
Muslims pray 5 times a day (a few minutes for each), give 2.5% of their wealth to charity once every year (which is cumpolsary but Muslims also give to charity freely throughout the year), fasting in the month of Ramadhan and if you can, going on Hajj (the pilgrimage) once in a lifetime.
Belief in angels, the books of God, the last day, the hereafter etc. are also part of Islamic belief.
Islam means achieving peace and salvation by submitting oneself to believe in One God.
Muslim means someone who does the above i.e. believes in the above.
The emphasis in Islam is to be a good person and do no harm to others. In fact there is a saying of the Prophet Muhammad peace be upon him that backbiting is worse than adultery.
You might find Zakir Naik's talk helpful. He goes back to the Hindu scriptures and finds that in the highest book of the Hindu religion, it has very similar beliefs to Islam. There's lots on YouTube on this but you can also read it as an article online. You might then find that Islam and the Hindu beliefs found in the Vedas are very similar.
Here's the link:
www.islam101.com/religions/hinduism/conceptOfGod.htm
The following verses from the Upanishads refer to the Concept of God:
"Ekam evadvitiyam"
"He is One only without a second."
[Chandogya Upanishad 6:2:1]1
"Na casya kascij janita na cadhipah."
"Of Him there are neither parents nor lord."
[Svetasvatara Upanishad 6:9]2
"Na tasya pratima asti"
"There is no likeness of Him."
[Svetasvatara Upanishad 4:19]3
The following verses from the Upanishad allude to the inability of man to imagine God in a particular form:
"Na samdrse tisthati rupam asya, na caksusa pasyati kas canainam."
"His form is not to be seen; no one sees Him with the eye."
[Svetasvatara Upanishad 4:20]4
Yajurveda
The following verses from the Yajurveda echo a similar concept of God:
"na tasya pratima asti
"There is no image of Him."
[Yajurveda 32:3]5
"shudhama poapvidham"
"He is bodyless and pure."
[Yajurveda 40:8]6
Basically if you agree these are books of Hinduism then you may find yourselves on the same pages (no pun intended) all along.
This is my understanding working with Hindus, Muslims, Christians and people of all faiths and no faiths. It's always been an interesting view.