Short answer: No, Sagittarius aren't "born cheaters." This fire sign values freedom and novelty, which can look flaky, but cheating comes down to character, communication, and compatibility, not a birthday. If you've been hurt by a Sagittarius (or anyone), your worry is valid. With clear boundaries, honesty, and mutual respect, many Sagittarians commit deeply and keep relationships exciting without crossing lines.

If you're dating a Sagittarius, lead with transparency: state your nonnegotiables, invite theirs, and design freedom that still protects trust. Keep things fresh with adventures, curiosity, and growth, because they thrive on movement. Agree on check-ins, social boundaries, and what counts as flirting. If you're Sagittarius, be explicit about your needs, close open loops quickly, and end mismatches cleanly instead of ghosting.