Rule one of harboring a secret crush: never get your hopes up. Especially if your crush is the nices...
Has regret but seme is a nice kind guy..the regret was LITERALLY that seme was so kind to Uke wirh bad home life,that Uke ended up crushing on him, and seme feels bad that ukes been through so much and thinks he fell for him only because he was kind,which is a reasonable thing to worry about!