18 dating a 28 year old, might be pregnant help ?

I've been dating this 28 year old 6 months ago we started when i was 17. We are still dating he spoils me takes me away on holiday pays for eberything, bt he can be controlling sexualy, does like me txting on my fone wen im with him etc and i fink he mite of tried to ger me preg, what does a 28 year old want with a 18 year old please help