Were building . . . ?!

What does that mean exactly?? what does "tiff, were building right now" mean?!

tonight i had one of the best convo's with my BD. we actually talked about ish. had a decent conversation. shared how we really felt about some ish.
but the one thing that really caught my ear was that "tiff, were building right now"

Over this past year, ive tried to really think about what ive done to make him not really like me anymore. or why he was sooo mad at me. when i got preggo things changed sooo much between us. partially because we barely knew eachother and now we were bringing someone else into the world. i soon found out that he was dating someone else. but since we were NOT together i could only tell him how i felt in a baby momma kinda way. lol
Overall i felt disrespected because i felt that i was willing to try to work it out and make something happen out of it but he clearly wasent.

time has passed and our son is 4 months old. sooo we talk and then he tells me "tiff, were building." i juss dont understand. i mean i love him with all my heart but i dont get it?! i dont understand how we are building if hes dating someone else.

wouldnt that confuse to as well??

i mean i juss dont understand i juss dont get why date anyone else if ur tryna make it work with me and you. ugh! im ultimatly frustrated. but its koo tho. lol.