Carl broke up with Lindsay primarily because he felt their relationship was not stable enough to move forward with a lifetime commitment like marriage. He believed there were foundational issues in their relationship, including poor communication, lack of trust, and feeling unhappy. Carl mentioned several specific reasons for ending the engagement: Lindsay had been derogatory toward him, she was not emotionally present over the last year, he felt she didn’t trust his sobriety and intentions, and their fights were frequent and unhealthy. Carl also felt controlled by Lindsay's vision for his career and said he was not ready for marriage or couples therapy indefinitely. Both Carl and Lindsay seem to share responsibility for their breakup, which was marked by significant emotional conflict and lack of alignment on key aspects of their relationship. These details were discussed publicly during Season 8 of Summer House and related interviews.