Should I get a divorce?

I am 25 yrs old. With 2 kids and 1 on the way by my husband. We have been married for 2 years. We have known each other for 6. We were good before we got married. But when we did. It's like problems that hit that I never expect from him. He CHANGED. He went from being to this loving husband to just DISTANT. He cheated on me pregnant with my son. He was texting someone. Then I thought he stopped. Then he went from that to hanging with his male friends even more. Then not only that. He did something even worse. He cheated on me for the "first time" and brought me back a STD. I asked for a DIVORCE. This was 3 months ago. Because I found out I was pregnant. I am now feeling regret. Like I should leave. I'm too scared to trust the man that I thought I knew. He confessed and said since we gotten married, things have been different. He doesn't get enough time with me and ect. And I told him "you would have all the time with me if you was AROUND. Time you get off, you shower. Go get something to eat. And come back late like you don't wanna home. Leave me here with 2 kids and all the responsibilities. I just don't think I can love him anymore from all he put me through. Or even trust him anymore. With my heart or health. I just feel like he got married cuz he had to and not cuz he wanted to. That's the vibe I'm getting from him. Am I wrong for feeling this way? Should I leave?