<human>: Give me the gist of the text in a nutshell

My boyfriend and I have been together since March, bust started talking in January, and dating since February. 

In February, after I met his parents and everything, he told me that he saw a serious future with me,  he met with an old hookup, and they hooked-up. 

I'm finding this out 4 months after being official, and I feel betrayed. I know we weren't official, but we were already sleeping over at each other's places, making out (not sex), met his whole family, and everything. It was between Valentine's Day and end of Feb. 

While newly dating, he didn't contact me on Valentines Day because he was getting his dick sucked by another female. 

Did he cheat on me? I feel like he did, since I straight up asked him if he was seeing anyone or talking to, or having relations with anyone else, and he told me no, once he met me, he knew I was it, and never wanted to be with another lady, repeatedly, over and over again.
<bot>: My now bf just told me he was getting his dick sucked by another girl when we were dating (not committed yet), and that's why he didn't contact me on Valentines Day. I don't know what to do.