New R&B song on radio - woman singing ... who & what is it??

I've heard it twice in the last two weeks, so I'm pretty sure it's a new song -- I always catch the end of it. The chorus goes, "I've been too strong for too long, now I can't be without you baby / I'm going to stay up at night until you get home because I can't sleep without you baby" and that's ALL I remember! It's sounds kinda like Mary J. Blige, although I don't think it's her ... can anyone help? It's driving me crazy!