How could my ex boyfriend get over me so fast?

Please no mean replies.

Me and my ex broke up almost a month ago. Always lots of arguing. We have to see each other everyday which is pretty painful.

The first week we checked on each other to make sure both of us are okay. He then stopped calling and so did I. Then we started again. He would call me saying he’s extremely depressed over the situation etc. Then when he saw me happy, he started coming around again saying he wants to try giving it another chance and I declined. This went on for about a week. He said no matter what he would always love me deep down and be friends.

We then got into a massive argument on the phone a week and a half ago when he found out I was seeing another guy , and it was never the same since and we blocked each other on everything.

I then tried to fix things yesterday because I don’t want him out of my life, just for him to say he’s completely moved on from me, he wants to be single and to leave him alone.

Did he mean this, or was he just trying to hurt me? I am so devastated over this situation.
How could my ex boyfriend get over me so fast?
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