. >> reporter: despite his extroverted persona, his personal life has been solitary. >> do i get lonely>> sure. you're on the road and not home. my dogs and my housekeeper who i live with, i'm attached to them. they're my sturdiness in my life. >> reporter: when was the last time you were in love? >> i don't think i'm in love with the person as much as i'm in love with what i do. no one should feel sorry for richard simmons, because i think i'm one of the most loved people in the world. >> reporter: there's a fascination, but also now a genuine concern. >>> nick was talking about how sincere he is. i've met him a few times. he's always like you see him on tv. full of energy and so nice to everybody in the room. >> i've heard the same thing. and i hope he's okay. >> reporter: richard, this is all out of love. we want to see you again. we miss you. >> has anybody checked the aisles of the baby gap? maybe he went shopping for new clothes. >> that's a great tank top. nic. big plans. so when i found out medicare doesn't pay all my medical expenses, i looked at my options. then i got a medica

. >> reporter: despite his extroverted persona, his personal life has been solitary. >> do i get lonely>> sure. you're on the road and not home. my dogs and my housekeeper who i live with, i'm attached to them. they're my sturdiness in my life. >> reporter: when was the last time you were in love? >> i don't think i'm in love with the person as much as i'm in love with what i do. no one should feel sorry for richard simmons, because i think i'm one of the most loved people in the world. >> reporter: there's a fascination, but also now a genuine concern. >>> nick was talking about how sincere he is. i've met him a few times. he's always like you see him on tv. full of energy and so nice to everybody in the room. >> i've heard the same thing. and i hope he's okay. >> reporter: richard, this is all out of love. we want to see you again. we miss you. >> has anybody checked the aisles of the baby gap? maybe he went shopping for new clothes. >> that's a great tank top. nic. big plans. so when i found out medicare doesn't pay all my medical expenses, i looked at my options. then i got a medica

. >> reporter: but despite his extroverted public persona, his personal life has always been a littlei get lonely sometimes? sure, you're on the road, you're not home, my dogs and my housekeeper, i'm attached to them. they're my, my sturdiness in my life. >> reporter: when was the last time you were in love? >> i don't think i'm in love with a person, as much as i'm in love with what i do. no one should feel sorry for richard simmons. because i think i'm one of the most loved people in the whole world. >> reporter: yes, there's a lurid tabloid fascination, but also now a genuine concern. dan with his chart-topping podcast says he just wants answers. >> he's an interesting, gentle guy. and i think that's part of why people like him. i think that's part of why people are worried about him now. because you feel that sensitivity, and you sort of feel, he's got a vulnerability. >> reporter: so far the podcast has explored the questions and conspiracies. >> i'm here to talk about dalmatians. this brings us to richard's disappearance number two, the dog theory. >> reporter: but found no evid

. >> reporter: but despite his extroverted public persona, his personal life has always been a little love? >> i don't think i'm in love with a person, as much as i'm in love with what i do. no one should feel sorry for richard simmons. because i think i'm one of the most loved people in the whole world. >> reporter: yes, there's a lurid tabloid fascination, but also now a genuine concern. dan with his chart-topping podcast says he just wants answers. >> he's an interesting, gentle guy. and i think that's part of why people like him. i think that's part of why people are worried about him now. because you feel that sensitivity, and you sort of feel, he's got a vulnerability. >> reporter: so far the podcast has explored the questions and conspiracies. >> i'm here to talk about dalmatians. this brings us to richard's disappearance number two, the dog theory. >> reporter: but found no evidence or answers. >> this isn't a witch-hunt. i just wish him well. i haven't talked to anybody who thinks richard simmons is fine. >> reporter: i'm nick watt for "nightline" in beverly hills. >>> if you