I've read a couple of your poems, although this is the only one I will comment on. I see a painful, heartbreaking theme in your works, and I think it's good you can find some peace in writing. I'm going through a tough time regarding matters of the heart right now too, so I can somewhat relate.
I really liked this poem, the simplicity works well. At some point everyone has said "if only," it's a common phrase. I really felt the emotion in this write, just like your others. Well done, keep writing. I think on your road of healing you've found a talent.
Simple: But it works for you in this poem. The emotions are real and you can feel it coming through the words and getting to the reader. The words are addicting and help the reader continue. Though love poems tend to be cliche, this one focused more on recognizing than losing love.
I suggest maybe taking the it out of some of the sentences, it really doesn't seem needed.