Hi, Juliana, and welcome,
You are mixed in with a dangerous man. As others have said, if he were a TRUE JW, he would not have dated, much less fallen in love with a non believer. I don't want to get into private matters, but if you have been in any way physical with him, including petting, touching of genitals, etc, he has again violated the rules of his religion. The fact that he has done these things, and is now insisting that you convert means he is confused, and uncertain of his own faith. One of the major downfalls with this religion is that they "disfellowship" members who break their rules, and if you are "disfellowshipped" even your own family members aren't allowed to talk to you. If you want proof of how this religion tears families apart, read the post regarding a letter sent to a former JW by her son. I don't remember the exact name of the post, but the mother goes by "Inky" in this forum. I'm sure you can find the letter. It will break your heart.
Get out now before it's too late. Believe me, this guy has a lot of problems, and you will spend the rest of our life trying to live up to a ridiculous standard that makes no logical sense.
Happyout (throwing a life preserver to Juliana)
edited to add the link to Inky's son's letter: http://www.jehovahs-witness.com/7/53530/1.ashx