No strings attached v relationship or?

I was with my ex for over 2 years, and he decided he wanted to do no strings attached. That was for the last 6 months until I broke up with him. Why would he turn our relationship into no strings attached?

My friend saw him an a dating app. On his main dating profile he has a picture of him and his kids. In the 2 years we we’re together he didn’t want me to meet them. Why would he have a profile picture of him and his kids if he doesn’t want anyone he’s dating to see them?
No strings attached v relationship or?
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