Staying on treatment and being undetectable means there is less virus in your body to pass on. It is called Treatment as Prevention, or TasP.
TasP can help lower the chance of spreading HIV by 96%. That means 96 times out of a hundred. That's a lot. But it is not 100%. So keep using condoms and safer sex to protect yourself and the people you care about.
TasP can help lower the chance of passing HIV on through sex by 96%.