He still wants to be friends after getting a girlfriend?

Hey guys, could I get opinions on why a guy would say: "Hey I just wanted to let you know I do have a girlfriend now so we can't no longer hangout, but we can still be friends!!" ?

I really enjoyed hooking up with him and genuinely do appreciate his company and would be happy to be his friend, but I don't want to seem like I’m allowing myself to be a backup option if him and his girlfriend don't work out.

Any advice on how I should respond is appreciated!
He still wants to be friends after getting a girlfriend?
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