Some people become more independent. If they were in a co - dependent relationship during the love story, after it ends, they learn to do things on their own, like paying bills, cooking for themselves, or making decisions without depending on their partner.
People's social lives can be different. They might expand their social circle. For instance, they could join new clubs or groups. Maybe they were in a relationship where their partner didn't like their friends, so after the break - up, they are free to be with those friends again and also make new ones. Also, they may become more cautious in future relationships. If they got hurt in the previous love story, they will be more careful about who they let into their heart next time.