Whether Brandon and Diya make it remains to be seen.  But they definitely have a hard road ahead of them.  As you've predicted, Brandon's past will create serious issues in their relationship.

Most of Diya's family doesn't know about Brandon (for reasons that will become increastingly clear), but she did tell her best friend Zeria and her sister, Chandi, about him in ch. 1 and 3 respectively.  When is comes to Brandon, Diya's been pretty forthcoming about everything except her feelings, and she's still trying to work through those herself.  Her family are the ones in the dark.  

Knowing all Brandon's secrets isn't a thing for Diya.  She was perfectly content calling off story time the first time he shut her down.  Brandon insisting she pick another tattoo only to stonewall her again was where her the attitude came from (compounded by all the day's annoyances that proceded).  She'd just blindly given him the trust he asked for with regards to Marisol only to find something else that, in her mind, he can't trust her with (hence the "reciprocity is for pussies" jab).  Then, when she challenges him about story time and his "I will love you eventually" statement in the next chapter, he seems to make light of it.  After realizing she's falling in love and he's not, but is still affected by his ex, she felt hurt by that.  Her reaction wasn't the best, but was, in my mind, understandable.  However, that is subject to interpretation.

Thanks for reading and reviewing, iamwhatiam!  Glad you're enjoying the story so far.