Hope_full

I never minded doing it but my when ever I did it to my ex he never came and I tried everything I mean everything and still nothing. I didn't know if it was me or him so I just stop giving him head now were not together anymore and so i haven't give in a LONG time and scaredn that it was me and i just don't what to do when I’m with another guy. Was i bad at doing it or was it him. Is it normal for a guy to not come during a BJ?