<human>: Can you give me the gist of the text in a nutshell?

I (18/f) have liked this guy (17/m) for 3 years off and on. In the last year, I have really had stronger feelings towards him. Four months ago now, he broke up with his girlfriend of 7 or so months. We had been talking more and spending more time together (at school/after school and before practice). 

3 weeks ago, he asked me to go out to dinner with him and his 2 little brothers (14 and 10, parents were out, and he was in charge of them). We had a great night. He even asked me to come back to his house and watch a movie. While hesitant, I did, and we had a fantastic night. Like a gentleman, he walked me to my car after the movie. I feel something might have happened, but I think I "pulled away," so nothing did happen. The next day was fine, but now I feel like things are slowly getting to be more strained. 

I wish this wasn't happening. If I hadn't have pulled away, I don't know what could have come of the night... I wish I could go back and see what might have been... Anyway, I found out this summer while he was dating his girlfriend that liked me a little over a year ago. So, I guess I have a few questions. What should I do? Tell him that I like him and risk our relationship becoming more strained if he doesn't reciprocate the feelings, or don't tell him? If I should tell him, how should I tell him? What do you think will come out of this???
<bot>: I have liked this guy for awhile, but our relationship is becoming more strained. Do I tell him I like him??? How do I tell him???