We're in danger

Our ex is probably going to resort to blackmail now

Without giving out too much detail, we have a memory of us and our sister when we were about 6-7, it's honestly been a root for horrible guilt and we NEED to see a therapist about it.

We told this to our ex, we didn't want to tell him the situation but he kept subtly blackmailing us about it and begging us to tell him.

Eventually we cracked under pressure and told him.

Now after we broke up, he's reposting stuff about hating us, calling us abusive and now he's softlaunching blackmailing us with this very situation.

We're so scared, it's been a root for guilt for years and years and we can't have it getting out.

First abuse, then manipulation and now this.

Please give us advice, we can't go through this, not now.

EDIT: he's also been softlaunching wanting to kill us recently, not enough to report but just enough that we're genuinely scared for our life