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They are both heavy going, but very satisfying. You could try: http://www.mangago.zone/read-manga/kyuuso_ha_cheese_no_yume_omiru/
and, in particular, its sequel:
http://www.mangago.zone/read-manga/sojou_no_koi_wa_nido_haneru/
The second story is where the process of regret and self-recriminations set in, but the first story is needed to understand the second one.
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Following^^
Fabulous suggestions - might I add that you really need to stick with it - it's a bit of a slow build up at first. Rather than one of those mangas that start out strong and then peter out, this gets better as it goes.
Any yaoi where seme really regrets being a playboy/playing around before meeting uke??
Ty :^)