<human>: Could you distill the essence of the text into 1-3 sentences?

I've been with Ben a year and a half now. Generally things are good with us, but a few things have been bothering me that I can't seem to shake. 

Firstly, Ben first told me he loved me after around 10 months together. That was the first and last time he has ever told me he loves me. In 8 months since initially saying it, he hasn't said it once of his own accord. The only time he will say it is if I say to him that I love him, he says "love you too". But it feels so awkward always being the one to say it first so I kinda stopped saying it as it felt like he only said it out of obligation. So now neither of us say it. 

I've asked him why and he said he's just not the type to say it. Don't get me wrong, I don't expect to hear it several times a day or even daily but every once in a while is nice, right? 

Also, I've never met his parents. He says he isn't that close to them, but he sees them at least once a week and every few weeks he will go on a day trip with them, his sister and his nephew. So he is clearly not that distant with them. I haven't pushed this subject too much yet, but it does bother me because I wonder if I haven't met them after a year and a half, will I ever? 

I don't know. Is this something I should worry about? Could it be a sign he is not that serious about our relationship?
<bot>: Boyfriend has only ever told me he loves me once in a year and a half, and has never introduced me to his parents. red flag?