How do you deal with seeing your ex on dating app?

I have broken up with my ex 20 days back. So, after 10 days I got back to the dating app. To my surprise, he was active on the app. He updated his photos and everything. And it struck my mind if he was using the dating app when we were in a relationship. While he was breaking up, he said he was busy and said he didn't want to be with me at the moment. He refused to open up with me on certain serious topics. I always asked him the entire time if he wants to stay with me. He wouldn't say much. So one day I told him I'm breaking up with him. I unfollowed and blocked him from everywhere so that I could move on. Today I saw him visiting my profile through different profiles. I feel that he was never really busy. He didn't want to spend time with me. I feel again that I was more invested in him than he was. And, it hurts.. But what can say?
How do you deal with seeing your ex on dating app?
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