 If you liked
Kyuuso wa Cheese no Yume wo Miru
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 ...then you might like
Rift
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I was re-reading both these manga, when I realized how similar they are. We have a dark haired het man whose life is turned upside down one day when he realizes that this young, blond and beautiful boy that he's known for long, is not only gay, but has been in love with him since forever. Not only that, but being in an unrequited love for this long has made the blond become slightly unhinged - he's jealous, obsessive, insecure, has a lot of emotional baggage and constantly fears that his love would leave him for another girl.