Carl and Lindsey trainwreck

I’m on season 8 where they’re prepping to get married. Lindsey accusing him of not being sober was insane! Really bad spot to be in before marriage. I wonder if they were truly in love or if it was more of a long-time friend love and they thought it made the most sense, then couldn’t stand each other once they were actually in it and doing it. The convo with his parents was so cringe lol