I'd Appreciate Some Advice

I have had a male cat, ELLIOTT, for nearly 2 years; he will be 3 years old this fall. I work days and Elliott is home alone all day, M-F; he is an indoor cat with all his claws intact. He is a well adjusted cat and is affectionate; he does not scratch furniture, carpet and so forth. Lately he seems to follow me around and want a lot of attention, especially in the mornings before I go to work. He likes to be petted and when I do he sometimes bites and then licks me, purring all the while. I do not think he is mad because he is purring loudly. When I walk away he chases and grabs my leg, he then lets go and runs away into his cat tunnel. I have never disciplined the cat, which is probably part of the problem. Anyhow some friends have encouraged, others have discouraged, me to get Elliott a friend. Those encouraging suggest he needs company; those discouraging say he'd miss being number one and have behavior problems. Perhaps I need to spend more time with Elliott playing. I'd appreciate any advise or thoughts. Thanks