As Soapy indicated, the writers have been hard pressed dealing with Peter Reckell's (Bo) schedule, and it does seem that his scenes were all filmed in a couple of days, then sprinkled throughout 2 months of shows. Thus he was dirty, filthy, etc. for a long time, and seemingly his only thoughts were of getting home to Hope. But since he never made an effort to do so all this time before, tis a bit far fetched.