SPOILERS ----
he got hurt by his mom :( When she was younger during a heat his mom got assaulted and got pregnant with him, he didn't find out until much later. But she would switch between showing him affection when sober and beating him harshly when drunk.
One day when she was drunk she confessed that she doesn't love him and that the pregnancy just happened, she didn't want him to be born. After that Dane thought that maybe she was telling the truth that day. One day, Dane got a really bad fever and went to bed. He woke up to his mom choking him. Turns out he was manifesting into an Omega and the mom thought it would better if they both die so he wouldn't have to suffer the same events she did living as an Omega. Dane shoved her off and lost consciousness (due to the fever). When he woke up she had already committed :(
After that trauma Dane's ability to love seemed to have shattered. Forgot to mention that a little before the tragedy with his mom took place he had a girlfriend that he wanted to propose to and marry. She was never mentioned again after the incident but her existence goes to show that Dane would've developed normally if it weren't for that trauma
SPOILER
Forgot to mention that his mother was assaulted by a group of men. She tried to get them prosecuted by they were found not guilty because technically she "consented" to it since she was in heat (ugh) After that her parents kicked her out of the house and disowned her because they were very religious and got mad at her for getting pregnant even though she didn't want it. Dane suffered a lot but the mom also had it really rough. Never excuses abuse but it does make you understand why she ended up the way she did

Damn Dane who hurt you