Is there a hidden meaning when a guy says it's been awhile?

Anonymous
I dated a guy for almost half a year. We stopped seeing each other after having an argument two months ago and had not spoken since then. Long story short, we were not in a relationship because he was not ready to be committed. After our last date, I communicated to him that I felt mistreated, while he felt very insulted by the words I used. He missed our dates twice because he fell asleep. Sometimes he would act very cold as if we were distant friends or just disappear for a few days before getting back in touch again. Also, he used to text and call me to meet up at night and never really did anything he promised.

However, I tried to make up and asked him if we could meet up for a talk, but it seemed that he tried to avoid seeing me. So, I decided to stop bothering him. He did not make any effort to initiate contact with me either. Last week was my birthday so he sent me a private message on Facebook, saying "It's been awhile. Happy birthday. I hope that everything is going well. All the best." I only replied that it was good to hear from him and I hoped that he was doing well too.

Could it indirectly mean that he wants to see each other again? There was one time that we did not go out for a month and he said something like "We haven't done anything in awhile. We should do something soon again". On the other hand, he might just want to be friendly and did not want me to misinterpret his intention? Because if he really wanted to talk to me, he could have just sent me that message via whatsapp instead of Facebook. We never communicated through Facebook before so I find this quite weird.

Could anyone please share their thoughts with me? Thank you.
Updates
+1 y
Just an update. I met him at a friend's graduation party a few weeks ago. We just greeted each other and didn't really talk. It was kinda awkward since I didn't know how to act, and I think he probably felt the same way. One week later he sent me a text, asking how I was doing, but I replied very briefly. A few days after, he invited me to his birthday party so I told him I wasn't sure if I would make it. On his birthday, I just sent him a text and he said thank you. Well, that's it :)
Is there a hidden meaning when a guy says it's been awhile?
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