Angry after a breakup!!

So after a six month relationship with someone, we broke up, he made a bunch of promises to me and then Got me all happy and then left. and I was very sad and tried to keep in contact with him as friends still. Now it’s a month after the breakup and I’m not talking to him because I am now angry for the way he treated me during our relationship and leading me on I guess.

Is it normal to feel this way only a month later lol? I’m honestly mad at him now and I wasn’t for a whole month after we ended. Does this mean I’m starting to move on or is this a bad thing?