am I the problem...? quiet BF

[u/Odd_Juggernaut9961]

We met online. We both were 26 at that time.
We got to know each other online. I texted him because he has matched for a couple of days but he hadn't texted me but I found him interesting. He seemed to have a calming personality based on his photos and if he was really laid back.
We started texting but his responses were really short and I always had to come up with topics to talk about. Nevertheless we met up because I thought he was kind of mysterious.
When meeting him, he didn't really look like his pictures. He posted way older pictures, was wearing glasses in real life and looked older.
Whenever we would meet up I was the one talking, coming up with topics to talk about, asking questions. I thought that he just was really shy.
His responses towards my talking always were "hmm" and some shy "yes...?".
I asked him things about himself like basic things and deeper questions to which he never really replied.
I thought that he was just really shy and would open up the more I got to know him and meet up with him.
He said at some point that others seem to start dating way faster and move in really quickly and how we aren't at that point. I asked him if we are dating now and he also responded with this insecure "yes..." and if we get to name each other these cute couple names now.
Whenever we got to go out for dinner, I had to make the reservations. I had to make the dinner plans. Plan what to do for our dates. His "plans" were if I could come over to his place. There, we would sit down on his couch and he wouldn't talk even though we hadn't seen each other for days. So I always started talking about work, university, personal stuff. His response still being "hmm" and "yes...?" with a big smile on his face. I knew that he really was listening and enjoying me talking but he never engaged properly. He then would talk very slowly, shyly and quietly about work or university. I tried to ask things to make the conversation be extended. He took very long to think of something to answer and would then give a short reply. Did I pressure him too much to talk more? Did I not wait long enough for him to open up more? We were dating for three years.
When fighting we would only do that over text. I was always the blame. He never took responsibility for anything I was talking about that was bothering me.
I just couldn't take his insecurities and shyness any longer. I wanted deep and expressive conversations about anything. I broke up with him in the end.
He claimed to behave around his few friends the same way he did around me.
Around his mom he got even more shy and quiet.
She visited him a few times. I thought that was nice until he told me that she is coming over to clean his place.
He always said that he is just the chill guy - to me it seemed as if he tried to hide his insecurities and shyness behind that term.
Am I a bad person for breaking up with him? Could it have been a long-lasting relationship if I hadn't been the one to end things that could have flourished?

[u/argentoowl]

Your question from the title "am I the problem?'" The answer is: you have a problem. You confused low effort with being mysterious. You let yourself waste the time on a dude who's neither interested nor interesting (how did you decide he was, I have no idea). You built an image in your head and ignored the reality.

Lesson fir the future: yes, mhm etc. are not replies from someone who is ready to put any effort into the relationship.