Rick's loneliness is not that he has lost his lover. Before losing his lover, he wanted to enjoy life with his lover. The bomb from the portal destroyed his life. Rick is a wise man and a madman. He disappeared for a long time and suddenly appeared in his daughter's life. Rick has his portal gun and can take him anywhere in the universe.
His grandson, Morty, arranged for Rick's assistant. Rick loves to drink too much, sometimes he is a little unreasonable and sometimes he is irresponsible, which worries Morty's parents. Morty is always the one who is cheated. Rick likes this little grandson. He always says something irrelevant. Rick will say that Morty is stupid, because with Morty, his life, his feelings and his loneliness are filled with his family.
Rick took Morty on an adventure to play with the universe he was tired of. He will also feel lonely and miserable. He has been looking for excitement and more things to fill his pain. Rick is a person with personality defects. He is very clever. He is not a compassionate person. He can't integrate into such a society. His pet phrase represents his pain. After being with his family, he has the courage to fight against loneliness.
The above contents refer to Baidu Encyclopedia Rick and Morty.