I'll keep it short so you don't get bored haha. Omega just goes with the flow and sleeps around because that's what people expect of him and he likes it that way. He sleeps with customer only to later find out she is engaged. The next person he sleeps with is her fiancee, which omega is unaware of. Fiancee sought out the omega out of revenge. The woman is the fiancee's one and only love. He thinks the woman was just one of many partners for the omega (aka not special at all) and wants to hurt the omega for carelessly taking his precious person. He ends up liking the omega and at the end reveals the whole story, drugs the omega, and abandons him with no way of contacting him again. Basically the couple treated the omega unfairly and took out their own issues on him. After this the omega starts taking things more seriously in hopes of finding his own love, which is why he starts taking his heat suppressants and moves into the omega only housing he had previously scorned.
Thanks!ヾ(❀╹◡╹)ﾉ~
Did somebody understood the last story. Because I did't ┑(￣Д ￣)┍