Feeling lost on what to do for the best

So I (m40) found out a few months ago that my gf (f43) of 8 years had been taking cocaine with her friends for almost a year and kept it secret from me.

I found out and confronted her and she apologised and promised it would stop and she will never take it again.

The part that hurt the most was that she betrayed my trust and did this knowing how much it would hurt me to find this out. The problem isn’t so much the drug use, but the face she kept it hidden from me for a year.
She even had drugs delivered to our house while I was sleeping in bed at night.

I love this woman deeply but now she has broken the trust I am finding it so difficult to believe anything she does or says. I feel suspicious of everything she does. When she goes to the shops alone, when she’s texting on her phone it all makes me suspicious and super paranoid.

The last three months I know she hasn’t taken anything as I’ve been very aware of her movements, this was something that I never used to take too much notice of as I had always trusted her, I never had any reason not to trust her before this.

Since finding this out I have had two therapy sessions and more booked in which have started to help but I still feel so lost as to whether this relationship is salvageable. Has anyone else been in this type of situation who could offer advice? She is the love of my life but this feels like too much of a betrayal to forget and move on from.

TLDR:
Gf kept cocaine use secret from me and broke my trust, now unsure of what to do for the best.