<human>: Summarize the given text in a few sentences.

My name is Michael. I am 16 and have been in a relationship with my girlfriend for a little over two years. In the last month, I have realized that I've become quite content with my relationship. It seems the spark, for me, is completely gone. In the past, I've had many nights where I felt the need to  be single, but i disregarded the thoughts and feelings as selfish and continued on with my relationship and then I would feel the same love as day one. Recently, though, the feeling just wont subside no matter how much i guilt trip myself. I feel that it is unfair to my girlfriend to continue this relationship, but I do not want to cause her the inevitable pain that our break up would bring. I mean, it's been 2 years. I also fear the wrath of her family. I do not believe that they would hurt me. It's just the thought of them hating me. At this point, I should mention that, as most would expect, we were each others' firsts, as in we took one another's virginity. Moving on, I have essentially lost all feelings for her. I fear that I may have some time ago, but I disregarded my own happiness and feelings as selfishness. Also not long ago, Sarah (my girlfriend) greatly offended me, which has brought out a sort of resentment for her. To make matters worse, I have met a girl my age at work who is seemingly perfect. 

So, what i need to know is whether or not I should break up with Sarah and how I should do it. It's worth noting that I care for her feelings and want to let her down as gently as possible if i break up with her. Please help, reddit.
<bot>: I have fallen out of love with my girlfriend of 2 years. We are sixteen and I am afraid to hurt her. Should i break things off?