How do I start to heal?

My husband and I have been together since high school. We got married last May and have been trying to conceive for the past couple months. I found out that he had messaged other women on Snapchat and sent pictures... he told one that he was wanting to be a dad but it just hasnt happened yet and is getting a divorce... I was hurt....I have been genuinely happy this whole time and I thought he was too. I feel like it all just came out of no where but he said it was because our sex life hasn't been exciting. I'm just trying to wrap my head everything... :/

Part of me wants to forgive him and the other part wants to just leave...I just want to be able to move on from this and heal