How do you define infidelity (cheating)?
Having an affair?
Hooking up after a drunk night?
Paid sex with an escort/prostitute
Happy ending massage?
French kissing someone?
Staying active on a dating site?
Flirting?
Sexting?
Imagine your husband beside you.
If you feel guilty when you imagine husband being beside you when you are doing that activity, then it is considered infidelity to me.