A feast for the eyes!

I have been married for one an a half years now. I am a 28 year old woman. My husband and I decided not to have kids until after two years of marriage, to enable us enjoy the home before the kids come.

Sometime last month, My husband was taking a shower after work. His phone rang and I decided to take the call for him. That is not wrong because we take each other's calls – I am his wife now! My husband stored this number as Seyi. I quickly took the call and what I heard really shocked me:

''Baby, I have been trying to call you, why didn't you pick my calls on time? Are you home yet? ''

I was stunned, just a year and a half into marriage and my hubby was already cheating on me? I answered the lady and told her I was Greg's wife and she quickly dropped the call. When he came out of the bathroom, I confronted him and he didn't deny. He asked me to forgive him, that it was the devil's handwork, that it would not repeat itself again – but it did.

I feel betrayed and cheated. Why did he cheat on me? What will happen when we start having kids? Should I cheat on him, so i don't feel hurt when he does the same?

Please I need your honest opinions.