I’m in a bad relationship bc I don’t value myself?

So ppl might say you don’t love yourself enough that’s why u are in a toxic relationship. How true is this? I don’t understand what I’m missing I definitely love myself I do have some insecurities once cheated on but I feel like it’s normal! What part am I missing out? It’s not my fault my partner wanted to cheat and lie to me.

Don’t judge me judge your mother, respectfully.