resurfacing of anger and resentment, how to let go

Hi Brooke, Love October so far! However I am a bit perplexed. I thought I had moved on with certain areas of anger and resentment within myself and I was now in a calmer place. Going through the decluttering exercises I suddenly realise that a lot of anger and resentment is resurfacing. I can’t change my hoarder partner, so I need to get away from this relationship, fine. So my query is, have I actually been suppressing and burying the anger and resentment all this time and not truly released it? Perhaps I’ve answered my own query, lol. Maybe I need to work on this for a longer time. Thanks.