Accepting Singlehood as God's Will for My Life

Soo...I am a 30 going on 31 year old Christian woman who dated through out my years but met someone I fell in love with and gave myself to physically when I was 27. We have been together on and off (more on than off) past 5 years. Recently, we have been going through a rough patch. I found out he slept with someone else while we weren't together. It's something not sure if I'll be able to work through. I really want to and told him I wanted us to start doing things the right way and grow in Christ. We keep slipping up. I'm unsure and feel we just might not work out. I thought I would've been married by now to my Boaz but I obviously have been doing wrong and have to accept my punishment and be ok with being single the rest of my life. It's all my fault.😢😢