Love or no?

Me and my bf have been dating for about 8 months now and lately I have been feeling like he's starting to not like me as much :( he used to drop hints about wanting to marry me and go to college by me so we can stay together yet today when I told him I was thinking about accepting the offer to a school by his he barely reacted and lately almost every time we hang he expects us to have some sort of sex. So my question is he in love with me like he says or is this just about sex ?