Could I go on a casual date with someone while I'm seeing someone?

Me and the guy aren't together but we do relationship things, it's been about 6 months now going on 7 , I would like to be more but ig he's still undecided , long story short a old Friend asked me to the movies who is a guy. I'm not one to date around but I do get bored especially on weekends (no friends) would I be wrong to agree? I really like the guy but he gives mixed signals sometimes and it frustrates me
Could I go on a casual date with someone while I'm seeing someone?
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