Something that did happened in life

That time passed so long ago, that maybe you doubt whether it happened at all, maybe you suspect my impressions are wrong (?) the empressement of mine, maybe you felicitate congratulate yourself on your choice, or even you even forget what happened and even forget me. But let me tell you: it did happened; it was so true and touching; it was my love in my heart. But it has passed, my dear friend.

[我是在加州长大的华裔美国人，所以我的解释中文可能会不太地道！请随时帮我修改. :D ]

Fully edited: (      Something that happened

So much time has passed that maybe you doubt whether it actually happened. Maybe you suspect that my love still endures, maybe you congratulate yourself on your choice, and maybe you have even forgotten our love and have even forgotten me. But let me tell you something: it did happen. It was so true and touching. There was true love in my heart. But it has passed, my dear.     )

Something that did happened in life [不太地道。Nothing or "Something that happened to me" would be better.]

Time past so long, So much time has passed [common expression] that maybe you doubt whether it happened. Maybe [地道的英文语法一般会比中文用的句点多，逗号少] you suspect the empressement of mine my ["empressment" 很不常用。你想表示的是"真诚"么？If yes, maybe "sincerity" or "genuine love" is better. Do you mean,  “我心里还有爱情"? ] that my love still endures, maybe you felicitate congratulate yourself on your choice, or ["and" sounds more 地道 - 可能应为你在提供一些可能性?] and maybe you forget have even forgotten what happened [不太地道.] our love and have even forget forgotten me. But let me tell you something [usually "to tell" sounds better with a direct object]: it did happened. It was so true and touching. It was my love in my heart. [不太地道。Maybe:] There was true love in my heart. But it has past passed, my [这里我没有真正的解释，但是作为母语者我觉得 "my dear", "my friend", 和 "dear friend" 在现代英语里都比 "my dear friend" 常见.] dear friend.

[My translation might sound a smidgeon more confrontational than you intended ( :D ), but the grammar should all be correct. Best of luck in your studies!]