Hurt & sad..

So today I caught my hubby talking on the phone with a girl. He was in the bathroom and I heard him talking and I went to listen and he was talking really sweet and I can hear a girls voice through his phone. I was so shocked.. I confronted him about it and he denied and denied until he finally told me the truth that he goes into a chatting line we're you can chat with girls in there.. I'm so hurt. And we just a had our baby a month ago. He told me to forgive him and he said he won't do it again. He said it was his fault and everything. He clearly saw how hurt I was because I was crying. I feel so broken.