How to get my ex back?

My baby daddy got his new girlfriend pregnant and they are moving away together. How can I get him back? I read their texts and He always says he loves her so much and is always talking sweet to her. But What if he secretly wants to marry me? and how can I convince him to not have a baby with her? Is it likely that he wants to be with me? Why is he doing this?
How to get my ex back?
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