My boyfriend works long hours and I get lonely, I told him and

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My boyfriend works long hours and I get lonely, I told him and one day he came home with a puppy which he said was for to keep me company.I brought the dog to the local park for walks where I ran into some dude who I really hit it off with. I invited him back to my place, one thing led to another and the next thing I know we are fucking. Right when we finished my boyfriend got home. The guy ran out trhough the back and my bf came in the front. He had brought me some flowers. He then saw that guys cum dripping down my leg and he got upset. I told him I got the dog to fuck me because I hadn't been satisfied by him. This really upset him. He called me a filthy whore and he got his stuff and drove off. Right before he went he told me he I have 2 weeks to pack my shit and get out.

How do I make things up with him? It was his fault to a certain extent. If he had just satisfied my sexual needs then this wouldn't have happened. How do I explain this to him without coming off as an asshole?