I need advice on these emotions I’m feeling post break up?

I was in a relationship with my ex for four years. I wasn’t perfect in anyway I definitely had my fair share of issues. The only difference between me and him was that I took accountability for my issues, and I tried my hardest to work on them to make him happy. Him on the other hand he just wanted to avoid conflict all in all and just decided since I took all the blame then he didn’t need to take any. manipulation situation here, he would threaten to break up with me when we had a big fight where I would stand my ground knowing that breaking up with me would shut me up and I would beg him to stay. This happened about 4 to 5 times throughout our entire relationship. I Stayed when I shouldn’t have and I knew he didn’t value me because of it. Was a hard-working student in a radiology program that was suffering emotionally due to the distress at my hospital. He knew this and still left me in the midst of it and a couple weeks later I got kicked out of my program. it’s been about three months since it happened. I also cut off my ex because he was confused about us getting back together and wanted to be friends but also wanted to be single., I decided that’s not enough for me, and I told him not to contact me unless he was serious about being with me. Haven’t talked to him in three months. My healing process is going great, but I have moments that if I made the right decision? I noticed on Instagram he looks like he’s having the time of his life and that hurts to feel like I’m easily replaceable. Any advice to help keep moving forward?

I need advice on these emotions I’m feeling post break up?
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