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?
All of the above, it is not acceptable to be doing any of those especially when your partner is a loving and a hardworking person. He/She doesnt deserve to be cheated.