Wo ai ni ,我爱你

As the others have said: Wo ai ni or 我爱你 But you need to know about tones in Chinese too, if you want to say it to someone. Wo and ni are third tone, and ai is fourth tone. This page: http://www.learn-mandarin-help.com/i-love-you-in-chinese.html has an mp3 you can listen to

and nice to meet you my friend

wo ai ni