Should I ask the guy I’ve been seeing if he’s seeing other girls? Is it wrong of me to ask as we’re only seeing each other and not exclusive?

I’ve been seeing this guy for about a month now and I like him so I want to know if he’s talking/seeing other girls, is it a good idea to ask him? We’re not in a relationship or exclusive, but we have been seeing each other and sleep together and stuff. I know he likes me as he’s always texting and calling me even when he’s busy, I’ve met a few of his mates and when I stay round his he makes me breakfast in bed and buys me my favourite chocolate and ice cream for when I go stay round. He also told me he’s told his mum about me too. However, the other day whilst with him some guy messaged me but I ignored it as I’m only interested in the guy I’m seeing and a few days later he asked me about the guy who messaged me, when I told him that I don’t speak to him and don’t want to and why didn’t he just ask on the day he said that it’s not his place to say anything as we’re not exclusive, and then said I can see and talk to whoever I want. So now I’m questioning if he’s seeing other people, do I ask him?
Should I ask the guy I’ve been seeing if he’s seeing other girls? Is it wrong of me to ask as we’re only seeing each other and not exclusive?
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