Hi ForGump, thanks for your response and maybe you are right, it does make me feel connected.
The important thing is that the physical intimacy (kissing) makes HIM feel connected to you. I know you can't easily tell, but that would be the reason to keep doing it.
If it only stokes YOUR feelings but is meaningless to him, I'd stop it. It's about what works for him to keep valuing you marriage.
In my opinion, I wouldn't want to do anything physically with someone that I suspected was involved with someone else.