Why do I feel this way?

So I saw my ex today he’s not a nice person and most would agree. It’s been years since I saw him and he was homeless and riddled with MH problems. I was sad I gave him £50 he looked at me but didn’t speak I was with our children he didn’t acknowledge them.
I hate him he did so much horrible stuff to my kids and I and if it were up to him me and his flesh and blood would be in that situation.
I feel so sad and sorry for him I want to go get him and bring him back home. My kids hate him and it would hurt them to bring him here. Why do I feel so awful about it? If it were me and he walked by he’d give me nothing and laugh
Why do I feel this way?
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