Do I have a right to be annoyed?

Preface: We have a child together. If I could block him and forget he exists I would.

Or am I overreacting? My ex always sends texts telling me he misses me. Our relationship was miserable. Every time he texts me it reminds me of all the shitty things that happened in our relationship and I want to explode and get it all off my chest. He also gives me gifts even though I ask him not to.

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