My ex left me for Jesus

Literally. I have been ex christian since I was a teenager, I'm now 32. I was in a 6 year relationship with someone who abruptly left me for Jesus, after six years of a non religious relationship... What would cause this? I'm SO confused.

He told me the night he left that he's praying for me and I am enough for Jesus. It was the single most bizarre experience coupled with heartbreaking experience of my life. Little to no extra explanation, just.. suddenly fell in love with Jesus more that our six year relationship where we planned to marry and have kids. Any ideas why this would happen? Any tips for accepting this event?