[tantaman]

It sounds silly & cliche but having a significant other will really help him out in this department.

Someone that you have to commit to. Someone that'll be there long enough to see all your bullshit and hypocrisies and call you out on them.

If you're alone, it's easy to commit to doing something only to later "forget" about the commitment when it is no longer convenient for you. A partner that you've made a commitment to won't forget it so easily.

The same goes for business. Maybe that's why startups often have strong co-founders.

[mike_esspe]

Not necessarily.

For me, when I'm living with someone, in several months I become a complete hermit. Probably because all my rudimentary needs for socialization are fulfilled.