Is me telling my boyfriend I don’t know if I’ll be with him in the future but I love him and I’m happy now an excuse for him to cheat?

My ex boyfriend asked me if I would leave him for a Jewish man cuz I’m Jewish and he’s not. I said I don’t know maybe but in my head I love him and honestly don’t care it’s more of pressure from my family. I left to
Europe for a month after we were texting everyday and talking but he cheated on me and did sexual things with a girl. But he told me it was my fault cuz I made him sad about what I had said. But I reassured him like crazy and felt horrible after and he still cheated. I don’t know anymore am I wrong?
Is me telling my boyfriend I don’t know if I’ll be with him in the future but I love him and I’m happy now an excuse for him to cheat?
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