<human>: Can you provide a brief rundown of the text in within 3 sentences?

I have fallen in love with my friend that helped me cope with the loss of my dog in November. I met her in July or August. I never noticed I had developed feelings for her until around New Years. She was there for me, so I feel the need to be there for her too. As a result, I help her whenever she has a bad day, and she really values my friendship.

The problem is that she has a boyfriend [20 M], and she wants to marry him. She started dating him in September. They have a really good relationship, and I don't want to get in the way. They have talked about getting married, and both are willing to do it. However, it is killing me inside seeing them together. I don't know what to do. She is a great friend to me, and I do not want to leave her. On the other hand, I want to stop feeling like I'm dying on the inside and move on. 

I do not know what else to do. I hope you guys can help me. Should I just deal with the pain to save her from it, and maybe they will break up?(I would never do anything to sabotage their relationship) Should I tell her how I feel and risk our friendship never being the same again?(I had an email written to tell her the other day, but my comp crashed and I kinda took that as a sign from God that I shouldn't tell her yet) Or do I just rip the bandaid off and end our friendship in hopes of being able to move on?
<bot>: I have fallen for a good friend that already has a boyfriend. They want to get married, and I do not know how I should handle it.