Bus Rileys Back in Town (1965) for better quality, see comment below Ann Margret, Michael Parks, Janet Margolin

A young man returns home after a three year tour of duty in the navy only to find things are somewhat different from when he left. His kid sister has grown into a young woman, the job he thought was waiting for him turns out to have some unique conditions, and perhaps most importantly his former sweetheart has married a wealthy and much older man. Disillusioned, he drifts from job to job while trying hard to avoid the advances of his former girlfriend, who is unhappy in her marriage and longs for something extra. While all he wants to do is make something of his life, his will power will be put to the ultimate test.