Update on my situation + book advice ?

Hello,

Some of you might remember my previous post (“he no longer says he likes me or misses me”). Thanks again for your insights, that was really helpful.

I ended up talking to him a little while after, with the covid situation and being stuck at his place (I lost my job) I needed to get this situation cleared specially after a bad day together where he has been in a bad mood all day and ruined it by insistin to be with me when I would have been happy to be on my own. I explained to him my concerns and why this situation was making me feel unhappy and sad. At first, he was taken aback, he froze and didn’t have much to say except hugging me and repeating how sorry he was. I tried to initiate a constructive discussion but nothing came out of it, he wouldn’t react much, maybe he didn’t know what to say or do?
So after a few hours, I took the heartbreaking decision to tell him I was leaving because the whole thing didn’t seem to have a chance to improve. That wasn’t to play games, at that time I really meant that and I already knew where I was going and how. He was horrified and realized the extend of my unhappiness and eventually we started to talk, really talk. He promised that he would make efforts with the relationship, explained why he has been mooody lately and what was making him feel nervous, and also promised he would try to communicate better.
He then stepped up hugely : he is back to his usual kind self, extremely attentive, he initiates sex a lot more, is way more affectionate and cuddly… he is away for work quite often lately and even if he still doesn’t say that he loves me or likes me, he sometimes uses affectionate words to let me know that he misses me (I guess it’s the best I can have ?) and always calls me in the evening. The thing that was probably helpful is that he had to be away for work for longer than usual and he told me that the last days away from me were really hard.

I keep going on with my life and my projects and I’m hoping it will all unfold in a positive way.
As I said, I lost my job with the covid 19, so I have plenty of time to read and improve myself. I read a lot this forum, I find some of the advices provided very useful, but I would like to know if you have any book recommendation regarding relationships ? I heard about the 5 languages of love, and I think that could be interesting because his way to show me he cares is definitely not the most common one. I will take gladly any other suggestion.

Thanks!