Safety is a massive part of what it takes for us to heal and grow.
A couple of tips that I have heard recently about how to keep yourself more safe as you walk through the world physically and electronically are as follows:
Not sure why you are still getting messages from someone you tried to block on your multiple devices?? If you have a mac, head into Messages - go to preferences - then account- then the blocked section.
Knowledge is power. Hopefully these can be of help.