Is this normal?

Me and my boyfriend been together a year, I’ve known him 5 years since I was 16 and he was 20 but it never worked out, anyway fast forward 5 years and I’m living across the country and I’m married, to a woman, he rings me out of the blue one morning and he’s crying his eyes out as his dog died, and we start talking again, things between me and my wife werent good anyways and we started getting feeling for each other. My wife found the messages and kicked me out, so I moved back in with my mum to be with this boy, he’s always smoked weed and used to be really bad on coke, I hate drugs and everything and ive told him a million times but he insists I’m boring and if it was any of his exes they would let him do what he wants, also I don’t like it as when he’s been on it he’s really horrible to me and violent, also we have been TTC for a year and it hasn’t happened, so I mentioned maybe thats the reason why, as he smokes so much weed everyday and does that, anyways he laid off it anyways while we were living seperately, then I moved in with him at his mums and 3 weeks on the trot he was taking it in the bed next to me while I was trying to sleep as I had a 13 hour shift the next day, which I thought was selfish, but he always words it to make me feel bad like I’m the one in the wrong, anyways I walked out and left him and we didn’t speak for a few days, then he called me and it got heated he told me he slept with someone else while we had seperated, anyways just wanted to know am I in the wrong? Am I boring? And i would you ever trust your man again if he said he slept with someone else?