Vaginal Tightness

So I have been with my boyfriend for a long time and our sex has always been incredible. Lately every once in a while for the past few weeks, my vagina has actually felt looser than normal(and we've both noticed because there is way less feeling). The only thing that has been in it recently is him, so I have no idea as to why it's feeling so different! If you have ANY idea as to why this may happen please help us!!!😩