It's a yaoi that starts with two boys and an incident involving a pedophile teacher. The manga follows them through the stages of their life as they slowly grow up, develop feelings for each other, get into a relationship, deal with troubles, and the story ends when they die of old age.

Extra info...One of the two cheats and has a one-night stand with a woman. She becomes pregnant, and he takes responsibility and marries her, breaking up with the other guy. After some years, she dies, and the two get back together and raise the son.

Help would be appreciated - thanks!

mmm Complex ?

it has the most of what you said, give it a try and see if its that one. sounds pretty similar.

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shuuu~

Yes, that's it! Thanks!