Watch Mechanics of Love for Free: How to Stream the Movie Online at 123Movies. . Mattilynn Dupree is back in her home town for her sister’s wedding, re-evaluating her life after missing out on the promotion she always wanted. She runs into an old friend, Jake, in her Dad’s auto mechanic shop and is given a reason to stay. But her ex-boyfriend comes to town to get her back, and her boss calls to lure her away with the promise of a better job, so she’s torn between the life she thought she always wanted and the one that she’s fallen in love with all over again.