The guy I’m dating is being cold?

I’ve been seeing this guy for 5 months now on and off. We get along really well. Recently he’s. Being really cold with me though? He’s replying in seconds but he’s just not acting how he usually does? He’s being less interested and coke and giving less enthusiastic answers. He’s been trying with me for years too and we haven’t had sex yet? I don’t know is it bad if I ask! He is still talking to me and replying so quickly but there’s just an energy change? I’m not sure if it’s because I haven’t had sex with him but we haven’t had the opportunity and he takes things slow? I’m not sure what it is shall I just ask? I’m not really really upset it just more gets to me in my mind?

The guy I’m dating is being cold?
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