My girlfriend has a crush on my son

I (M41) married my wife when our son was born. He's 17 years old now. My wife and I have a good relationship, but are not the most physically affectionate couple. She (F37) is active and athletic, and I think she likes that my son is taking an interest in the same type of activities. She's emotionally unavailable and has not been physically affectionate with me since our son was born. <br><br>I do love her. She's a good woman and I've noticed her being more physically affectionate with our son. She will give him hugs when he comes home, or massage his shoulders. She also seems to want me to see her do this. She's a lot more physically affectionate with our son but has not said anything to me when I hug her. This is strange since we're not physically affectionate. <br><br>I think she has a crush on our son. He's a good looking guy and I know there are other women who like him. I'm ok with her being physically affectionate with him but I don't want her to do something that could create tension or make him uncomfortable.