PLease Read

So few months ago I met this guy on facebook and we totally hit it off.He is exactly my type in every aspect (well so i thought) he would take me to nice restaurants,movies things normal couples do.We held off on the sex part cz i told him I wasn't ready and if he wants to get laid his free I can't hold him back just cz I dont feel comfortable (i have a weird personality Sex needs to feel right for me not only attraction)But he was totally okay wth it,he would constantly write to me,call me act like the jealous bf type,wanted to know where im going what im doing anyways long story short.Few days ago we finally had sex and it was amazing only problem was he wouldnt cum and only came thru oral (we had sex twice)to me it felt weird cz I never had a issue like that with a guy but I felt weird asking him about it also so i let it be.But he kept telling me how amazing everything was and he cnt stop thinking bout me and my body and it was best he ever had -__- bla bla bla.Tonight was sex day 2nd same shit and when we finished he told me I think im falling in love wth u and its scaring me,I laughed cz i got nervous didnt knw what to reply so I said y u scare,he said cz ull leave me,I asked why and he said because im  and has a newborn baby.My heart sank to my knees and I started shaking and i told him u were right for being scared cz im gone and I left.I took a uber and left meanwhile his raping my phone with calls n txts.I never suspected anything cz he was never weird about going out in public,didnt have one girl pics in hus fb account.Point is not im a million years would i be wth someone who has a family knowingly after today his dead to me.I blocked his numbers (his calling wth other numbers) eventually that will end also.But my question out of this whole story is why couldnt he cum with sex? only thru oral...He was on antibiotics this week could that have caused it? was it stress knowing his married? (which i doubt cz jerk seems careless when it came to his marriage) Was he not attracted to me? (but thn i think of he didnt enjoy or find me attractive he wouldnt he on my ass 24/7 like he was) Idk its a question thats bothering me.It doesnt matter now its history to me.But I just wana know if i was possibly doing something wrong? cz now i feel like a zero in sex.Sorry for all the typos and grammers