Doing both is not an option. Ultimately the school will find out, and your teaching certificate will probably get revoked. At least some school districts have clauses saying, "moral" or "model for the community" [as in model citizen, NOT nude model]. I know of a teacher who was merely accused of inappropriate behavior by a student and ultimately lost his job.
Honor the promise to your fiance. If you value him, then continue to show that value.
Doesn't being a nude model make you feel ashamed? (Not for past choices, but if you go back to it)
I heard the "merely accused" by speaking with a former superintendent