Why does my boyfriend want to make a point of showing affection in front of my kids who aren't his?

No mouth kissing but he will go for a neck snuggle, holding my hand or feeding me food if we are eating. I don't feel so comfortable with it so then he will play footsies with me instead. He's super affectionate with them too.
Why does my boyfriend want to make a point of showing affection in front of my kids who arent his?
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I just want to thank everyone who has weighed in so far.
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It was haaaarrrd choosing the MHOs. The convos on this are so amazing! @Ghostluck flicked my balls and got me to calm down. @driven159 amazing! @anon1903 thanks for hearing me out girl. @Sonorous and @Pinay_ako very helpful too. Thanks everybody, even the people who insulted me! This was a very real situation and you guys showed the G@G is a place where people really do help each other. Thank you!
Why does my boyfriend want to make a point of showing affection in front of my kids who aren't his?
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