I have been with an INTJ male for just about 5 years now. It has been rocky to say the least.. He thinks I am an ISFJ and sometimes I agree however, not consistently.
My motto is "let him come to me". The INTJ that I am with tends to need his "alone" time, which usually involves being on the computer reading, posting, playing games, or working on a project, at least once daily. When he is on the computer there can be negative reactions in his behaviour, which manifest as utter annoyance, at things like interruptions. This can become extremely frustrating because although I am an introvert myself and enjoy the time to be in my own mind.... it can drag out for hours and hours.
The display of emotion on their face and refusal to verbalize any concerns or thoughts when asked can also be frustrating. Keep in mind that there is a good probability that the reason your INTJ hasn't said anything to you about is because he is still going over it in his head. He still has to gather, organize, analyze, and interpret. Then, when he has combed through his thoughts, gathered all of his information and formed his opinions and feelings, he will share.
Everyone here is right when they say if he is texting you (without the motive to get rid of you... you would know if this were the case) then he likes you. Everyday, contentless, fluff talk is not something INTJ's like to do nor are really willing to do to make someone happy. It is too mundane for them, it is using precious time and energy that can be spent inside their heads where only they know what is happening (and from I hear/read it's some pretty cool shit). I like to get a text at least once a day just to say hey I am thinking about you... so I have figured out that if I send one text mid-day saying "Hey, How are you? *insert something about your day, something you read in the paper, something other than fluff* Hope your day is going well love you!" 9/10 I will get a response and that is enough for me to be satisfied until I see him. Sometimes if the information I provided in my text is interesting to him we will exhange a few texts and if not he doesn't say anything about it really and we move on. This is a give-take thing. I don't want to force him to do something silly like this to make me happy when I can compromise and still get what I am looking for and benefit in the long run. If you force INTJ's to disperse their energy into small things to make you happy there will be no stores left for the big things.
INTJ's are unique people and they need to be treated as such. You can learn a lot from them and really fall in love with them. They are always challenging you and and your mind. If you stick around it will be tough but be open minded, listen to him, take his advice, and once in a while don't BUT give him sound logical reason as to why not.
Getting over feeling nervous... it does not come easy AT ALL. However, it gets better.. Exercise your mind while he is exercising his. Show gratitude when he gives you his time and his attention. Most of all, don't keep anything hidden from him.. feelings, thoughts, opinions whatever... Just tell him in few words, do not repeat yourself, and be logical.
I wish you Good Luck!