don't know him, or your situation, so i can't say for certain how he would react, but you should tell him if your relationship is growing closer. living a lie with someone who you might spend the rest of your life with is going to be a horrible thing. at the same time, if you've only been together two weeks, i would test the water a little longer before the plunge.
i would meditate on the question, or ask the God and Goddess for help, the answer should come to you. [though you probably won't hear a voice say 'you should do this' it could come in a dream, a feeling, or a seemingly random occurrence] when you feel ready to tell him, sit him down, ask him not to respond until you're finished, then calmly explain to him your faith. be sure to stress you do not worship the devil, as well as the Rede strongly forbids doing any harm to any living thing. providing books, sites, and other information could also help. once your finished, ask him what he feels/thinks. you might be totally accepted, rejected, or land somewhere in the middle depending on how open he is, how religious he is, and how much he cares for you. for some people being Wiccan can end a relationship, some it's no big deal, and there are others who will claim to be fine with your faith, but mock you at every chance. [not to upset you, just preparing you for the possible outcomes]
when i told my boyfriend he was completely fine with it. he had looked into Wicca in his youth, but never converted. [he's very spiritual but doesn't have an actual faith so to speak] my covenmate told his fiance [who is catholic] she had her doubts, but agreed to come to a couple Sabbats to see what he believed. [helpful tip, don't bring your boyfriend to a Samhain circle if he thinks you summon demons, spirits, and/or dark beings, it'll only end badly.] she wasn't too happy with Samhain, but she warmed up to Yule and Imbolc. if he agrees to observe, don't force him in the circle, if he just wants to stand outside it, let him. while some people never warm up to the idea, patience and time is what's key in most situations. [meaning if he's unsure]