Opinions/advice

So I'm 18 and have been sexually active for a good few years. I feel like I'm more sexually mature if that makes sense compared to boys my own age and I've never really loved sex with them
However, the past two months I've started hooking up with a close family friend who is 27. We like each other but there's nothing serious yet, the sex is incredible and he knows exactly what to do!
We keep seeing each other and I'm scared if it gets more serious I won't be able to break it to my family or how would I even go about it. He says he doesn't feel like I'm 18 or any more immature compared to him so he's fine with things moving on but he also doesn't want a bad name for himself dating a younger girl.