How to spice up a relationship?

Hey! So I've been dating this guy for 6 months now and lately I feel like he's been slipping away from me. This isn't the first time I've felt this way so whenever I get the vibes from him I try to spice~ it up like I try to get romantic nights, I've had sex with him on the beach, at his office, in his car, you mention it. I've also tried to get us to like spend weekends alone and disconnected from everything and it never fails to make him happy and we're back on track but like a month ago he began to act this way again and I really don't know what else to do so if you'd like to give me some advice :) I'm all ears
How to spice up a relationship?
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