Welcome frost, to psychcentral.

That the other family blames you is their problem, and obviously a pattern of their dysfunctional family. That it still bothers you is more my concern.

Glad your bf can feel secure enough to make the suggestion for you. What can it hurt to return and refresh with a therapist? Maybe the one year was able to put you on a functional level for that time, but didn't square away everything? No fault involved.

Nothing silly about it, your way of coping no longer is working and now you can work on it some more. What's wrong with that? Nothing imo.

Everyone needs therapy from time to time. It's those who recognize this and go for help that are the winners! TC welcome again.