I asked for forgiveness but questioning now if I did the right thing?

I fell in love with a man who lied to me and found out in the end he took advantage of me for my money. There is a lot more to this story but it is too long but we were involved for 3 years. He ended up moving thousands of miles away and the last communication I had with him was over 7 months ago where he sent me an email telling me I was "mean-spirited." I have harbored a lot of resentment and bitterness and I need to find peace and I can't. I listened to a speaker last night and he said to the group that people who can't find peace maybe have these feelings because of not making this right. I thought that this would find me peace so I emailed him and asked him to forgive me for any pain I caused during our relationship and how I wanted him to have peace and told him the best of luck. Now I should feel some closure and good feelings so why do I think I shouldn't have? Did I do the right thing in telling him this? Will I get the peace I so desperately need?