[sarasi]

Your friend had only studied Japanese for 5 months (it takes years to be fluent, particularly in written Japanese), so at that point still didn't really know how to construct a proper Japanese sentence (or write kanji well), so he has just given you individual words- as above, heart, one person, and (badly written) flame. There is no way to interpret the meaning other than just looking at the words and reading whatever you want into them. It's the same as writing "heart, one person, flame" in English- just a string of words.

The sentence KyleGoetz gave you is one way that you could take the meaning of the 3 words and make a proper sentence out of it- "the one person who makes my heart/soul burn like fire"- Kyle Goetz explained that that was the meaning, but you seem to have missed that at some point. And whether that's what your friend actually meant is known only to him.