This sentence means that she or he doesn't want to have an affair with you because you have an relationship with other people and she or he just your plan B when you break up .暧昧means you have something with someone but not reach an relationship .才不means absolutely not .备胎means share tire but in this sentence mean she or he just your plan B or C or D when you finished an relationship .玩累了means she or he is tired and will not going to have a date with you

Ok,dude,let me translate it：playboy，leave me along！

暧昧 say not clearly, vague,blur,indistinct说不清楚的意思。 备胎，a wheel instead of a broken wheel 玩累了play too tired