Falling out of love?

So my boyfriend and I have been dating for almost 3 years. We have had a crush on each other since the 4th grade (we are in 12th now). Through our relationship he has helped me with so much, he even saved me. We barely ever fight and always communicate our problems. I love this and with all my heart and I know he does too, he wouldn't do anything to hurt me. Lately being around I'm sometimes and certain things he does irritate me easily. And sometimes I don't think I like him in that way anymore. However, when I think about loosing him my heart aches and I don't want to leave him. I feel like I still really really love this man, am I falling out of love?