Why do only women who are in relationships show interest in me?

It happened to me a lot of times that I flirted with some women, I showed interest in them, they showed some interest in me, I asked them out, they accepted. And then during the date they told me they were in a relationship or they told me after the date. One woman didn't even tell me about it after I flirted with her and asked her out. She seemed to become reluctant at some point so I thought she changed her mind, only to find out from other people later that she had a boyfriend. How could I trust women when I have a relationship if this happened to me so many times? They didn't cheat, but they crossed some boundaries.

PS When it felt like it was the right moment to kiss a woman, she told me that her boyfriend recently broke up with her, but she wants another chance with him.

Why do only women who are in relationships show interest in me?
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