I think you better call befrienders bro if you really cant take it. Im a christian too, and as a christian brother I encourage you to go to church and get comfy there and talk to some pastors there as they can help you more in your struggles. Most of our struggles happen because God wants us to go closer to Him. I have my issues with my GF too and she's a christian also, and we do have our share of emotional, physical, mental and spiritual problems that we sometimes share with each other. But we do give it up to God in prayer and right now we are doing better than before. We are together for almost 2 years now, last year was a roller coaster, i dont want to share our stories here as i deem it private. But if you're eager to start a new, you can PM me and we talk further bro. This could be your time to turn fully to God 100% for Him to work through you, and maybe your ex will see it and it all will end happily ever after.

God bless you and your ex bro. I pray you both will find peace with each other and start a new.