Does consent or a mutal agreement make it okay?

Anonymous
So me and my girlfriend are in a mutual agreement that we will have a Casual relationship with no commitments from each other. So we pretty much still go out on dates have sex but both known that what we are doing has a timeline.
I have felt very bad about our agreement and feel ike if find someone else i wanna date i will end up hurting my girlfriend. My girlfriend has said she's 100% okay with our new dating style and has talked to a few guys while I haven't talked to anyone.

I love my girlfriend and she loves me but after 7 years she decided she no longer wants kids which is a deal breaker for me. We both don't wanna go back to be single or not having sex with anyone at all so we decided it be better we still sleep with each other plus go on dates since we are comfortable with each other. I im not worried about being hurt myself she did go on a few dates with one guy be he turned out to be crazy so she stopped talking to him. I pretty much just want to be told from people here that theirs nothing wrong with a none serous relationship
Does consent or a mutal agreement make it okay?
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