Why was he so irresponsible to cum inside me if he has a girlfriend?

Anonymous
I didn't know he had a girlfriend. I see him every night on the way back from work. We get our coffee from the same place and we always stop and have a chat.
I've "Known" him for two years, but never really knew anything about him apart from his name, his job and his coffee order.
Yesterday I saw him at the coffee shop, and I was on my way home to watch the Portugal-Spain game and he asked me if I wanted company.
We had a few beers and watched the game. Afterwards we had sex on the couch and then he left.
Today I went to get a coffee and there's a girl who works there who I chat to quite a lot, and she asked me if I went home with him last night, and then she was like "Did you know he's got a girlfriend?"

I genuinely didn't know, he's never mentioned her or hinted about it. He acts completely single.

Whatever the reasons for him cheating on her ( I doubt I'm the only one) why be so irresponsible about it?
That's what's made me the most angry.
Why was he so irresponsible to cum inside me if he has a girlfriend?
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