Does every newlywed couple go though so much the first year?

Me and my husband been together since christmas of '07 and been married since sept of last year. Have one son together and a daughter each from outside of our marriage. Well weve had problems he would accuse me of things bc i had talked to my guy friends behind his back and he found out but not knowing he had cheated on me with three different girls and one was his babymama almost 3 years ago but not too long ago confessed. Its been bothering me bc i didnt expect that from him but blames me because i talked to my guy friends. Did i do wrong or is he wrong? We are expecting our second child and i just want all this unnecessary arguments gone for good. Please help?!