I feel like my husband is cheating

When I was pregnant my husband cheated on me, it is really hard being with him. I honestly don’t know why I stayed. But lately he’s been staying “overtime “ at work like excessively. And today he said he was going to wallmart which isn’t even five minutes away and took around two hours. I feel like im just hurting myself. He’s really good to me and the baby it’s just things like these that unbalance it. Please don’t judge I just need some advice. 😔😏