i think my husband still has unfinished business with his ex

I am married for 6 months now. Our relationship before we tied the knot was long distanced so i did not have any idea that he still had relationship with this woman even when we were already dating. All i knew was that they were separated a year before we met,and that they lived in together for 6 years along with his step-daughter.I discovered about their still ongoing relationship when i saw the messages on his facebook. I was so shocked when i read the recent messages that this woman was hurting and his 8 year-old stepdaughter was cursing me as a ¨demon bride¨ for destroying their relationship.My heart was really crushed but i did not fight with him. Instead,i asked him about them and he said his ex and his stepdaughter are living in another city now and i dont have to worry because they have not seen each other for more than a year already after they broke up and his ex was just inventing stories. I tried to believe him but i saw their pictures again on a birthday party of his nephew 6 months before we got married.I ask him again about that but he said his ex was just invited because his relatives treat her as a family already since they lived in for long.Then he reassured me again not to worry and to just trust him.Last Christmas he received a call from someone,obviously the caller was not ordinary one because he really had to go to the kitchen and talked for almost an hour,his face was so happy and i even heard him saying kisses.After that call he kept on embracing me saying he loves me so much but i was already doubting that time. I asked him who it was and he said his friend.But as the days passed,i notice d that he kept on calling that number everyday coz it was registered on his phone.maybe he noticed that i checked his phone he began to hide his phone and deleted that number after he called. I confronted him about that,until he told me that it was his stepdaughter he has been calling almost everyday. And he has been hiding from me because ill get jealous. I told him if i only knew that it was his ex-stepdaughter there would be no problem.But the issue is after that he still keep on hiding his phone. I think its not the child he is talking about but the mom. I discovered too through a message that he would give them money monthly.I may sound selfish but why does he still have to support them?I really dont understand...why does he still have to get in touch with them,as far as im concerned,he has no responsibility to them,and the child is not even his biogical daughter.im so confused and im really hurting...

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