Before you say it, be careful. Ask yourself "Is her happiness absolutely essential to my own?". If the answer is yes than go ahead and tell her. After you say it the first time it will be like a dam bursting (or at least it should be.) This means that you'll be sayin it a lot. Provided they feel the same way as the man who says it, women like to hear a man say it out loud - and often.

Depends on how long you have been together or how much you've had to drink! Its up to you, Those 3 words can take a relationship to another level.... however its up to you whether or not you want to take it there. Just make sure its sincere and honest if you do tell her you love her!

Hi there, it depends how long you've been with your girlfriend and whether you are prepared to declare your love to her.

你好， 当然，你可以说她 ”我爱你“ = " i love you ",but you don't have to ,just if you feel it :)

If you feel moved to, yes. If you don't, maybe she is not your girlfriend, maybe your friend, your playmate. Spend some time apart. If you find yourself wishing you could say it, then there is your answer.