it means that he just wants to date you.
They don't want to get at all serious
You can say "Ils sont sérieux" in French to mean "they are serious."
He means that he thinks you are getting serious and doesn't want to hurt you. He wants to be friends, that is all.
say you want to talk then just build up your confidece and say it
He thinks you have an agenda - something you specifically want to say. If it is serious, you may want to offer him an idea of your topic and offer to meet him later to discuss.
When we say on a serious note, we mean jokes apart , let's be serious now, something like that!
If a person say "For real", it means they are being completely serious or they want a serious answer, etc.
When you say "i want you" to your girlfriend that means you want to have sex with her.
he will try and resist you when you want to get closer and may not say he loves you when you say it too.
Well, if they say it with a serious and straight face and if their face is red and they look kinda embarressed then its true. But if they say it with a smile and looks like they want to laugh, they are just playing around with you.
by telling it that its not too serious because you have a plan with it
It can mean any thing you want it to mean, or you can say it when you don't know what to say.