Good for you for starting suboxone and getting off opiates - that's tough.
As for the grilfriend, I suspect she's a symptom of bigger /deeper issues. I'm not saying she's not a trigger - everyone's triggers are different, but if you were totally over her, if you are at all like me, you'd find some other emotion to want to numb. Give it time. Therapy takes time. And a month clean, while great, isn't that long - your brain's still adjusting to its new normal.
splitimage
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba