Twelver and zaydi

Salam alaikum, recently a respectable brother showed interest in marriage (to me). He is kind, respectful, and a genuine good person. Everything was halal, and we ended on good terms, and we haven’t spoken (in like 3 days) but the reason we didn’t continue was the fact he was a shia twelver that converted to the zaydi madhhab (doctrine). When asked why the change, he said that the imama of the imams after imam al hussain (as) didn’t make sense to him. Like I mentioned.. we have stopped talking..

but are there any books that proves why the twelver shia beliefs is correct? Its for personal education and knowledge. And please make dua for him to be guided back on the correct path🤲🏼