the boy i loved

[Richard]

Hey ec514,
Welcome to the site  

It's difficult to write an original love poem these days, and I think your piece suffers because of that. I'll go into more detail below:

the boy i loved, he sang for me: -I noticed that a lot your lines are in iambics. There's nothing wrong with that, but then there are times you break the rhythm, which, in my opinion, should only be done intentionally and to add emphasis. Then some would say too, that rhythm should be consistent all the way through. I'm making this point because this is something you need to think about when you edit this poem.
i danced and smiled happily. -I know one can "smile sadly," but smiling is usually associated with being happy. To me, "smiled happily" is a bit redundant.
the joy i had could not compare;
i've searched for it most everywhere -The last two lines here don't add much. The speaker already said they were happy, so why mention it again? The joy would be more interesting if the speaker could find something to compare it to through a metaphor or a simile.

the time we shared could not be priced. -I have no problem playing around with the ideas of time and money. You should consider expanding on it more. For example, what would be the currency if there was a price?
the seconds we had made my life. -What was the speaker's life made into? I would suggest rewording this line.
but like all good things, we would fade. -The expression, "like all good things" is way too cliched. Again, consider rewording this line.
his song would cease, my heart would break. -I like "his song would cease". You should end the line there because the reader should be able to figure out that means the speaker's heart is broken, or something is wrong with the relationship.

i cried and wept, "my musician!"  -The wording, "i cried and wept" is a bit redundant, so you need to pick one.
he was gone, left on a mission. -The use of the word "mission" makes me think the musician joined the army. Was that your intention?
i wished him well, i said goodbye -This sounds way too formal for a heart breaking goodbye. This line would have much more impact if you described some of the hysterics the speaker said because they were so heart broken by the breakup.
he didn't look back but i heard him sigh. -It would be a stronger ending if the speaker didn't look back. Like the other critique pointed out, you don't need to change focus in the last line.

I feel like I was very harsh here, but I hope some of what I said helps you in editing this piece.

Thanks for the read,
Richard