What do guys at age around 25-27 want!

Honestly will they ever stop fooling around and lying! He said he missed me and wanted to be with me and that he had broken up with his ex but when i met him at his house yesterday talk it out i see his ex girlfriend fuckn dog at his house!! He said he had just got a dog. And then she was texting him and kept calling him! Wtf! He ignored it all but it was clear to me they are still seeing each other.

Sorry for my language. I'm just mad.

I miss him but i cut him off my life! Told him it was done. Thought by that age they be a bit mature of what they want in life by now. He will be 27 in a few weeks. I'm 23 and im trying to make a best of me. I blocked him but i know he will be back like always but im ready to move on. It will be hard but staying positive.