why couldn't jacob move with someone else

When edward left bella in forks he thought that if he and his family leave for good and bella was so depressed she thought that with learning to ride a moter bike she would see him again but that work for her then she decides that jumping off a cliff would help her see edward again but jacob pulled her out of the water in time when bella got home alice was there to see her without telling edward where she was going but then roselie told edward where alice went he called bella's house phone jacob picked up the phone then edward was told that bella's father was aranging a funeral edward got upset thought it was bella who died but she was alive i don't know why jacob would tell such a thing to him on the phone then bella went to italy to show edward that bella was alive when she edward and his entire family came back jacob told edward that if he and his family ever bite a human the truce is off when bella told jacob that she will always be with edward and that she is going to be like edward and his family jacob got upset and said he wouldn't let her be like edward's family but that was not his choice it was her choice and she made that right choice for herself so jacob should just get over bella and get on with his life with someone else.