My question involves criminal law for the state of: Florida

My fiancé while working as a photographer was charged 3 yrs ago w/ having sex 1 time w/ a 16 yr old model. He said he's innocent but took the plea of 5 yrs sex offender probation with no added jail time because the prosecution wanted him in prison for 15 yrs if he went to trial and lost. He's done well on probation. He passed both polygraph tests, attended court order sex offender therapy, held a stable job for over a year, etc.

His landlord told him to move same day to a new place in the same trailer park just a couple doors down he owned because he rented out the current one to new tenants. He tried to contact his probation officer but her voice mail was full. She showed up right after the 48hr limit, saw he had moved a couple doors down and had him arrested for VOP. He's currently in jail w/ no bond. Other than the charge from the girl 3 years ago and the current VOP, he's never been arrested and had a clean record. He's been assigned a public defender that he got maybe 5 minutes with and his pre-trial conference is scheduled for January.

His landlord has written a letter of recommendation for reinstatement of his probation and is willing to go on record stating he did indeed ask my fiancé to move. His cell phone which is currently in police custody should have the sent calls on it to show that he did indeed try to contact his PO. So far the public defender has not contacted the landlord yet for the investigation but I understand she is busy and there is time. I have heard his judge is tough and will not hesitate to send people to jail and may even pull his original plea deal so he could now be facing the 15 years in prison. We're all terrified and I don't know what to expect. This was not a willful violation. What can I expect to happen realistically? Is it possible that the phone calls and letter from the landlord could be enough to free him?