Nipple sucking ...

So I have been with my boyfriend for a couple of months so the other night me and him were in his truck all good talking and stuff nice night . When things started to get freaky . No, we didn't have sex . He started to take my bra off and suck on my nipples play with them and yeah. most people have told me when he sucks on your nipples , that it is the " best feeling !" I didn't react to it ... I feel like he kinda got mad . Is it normal ?