Pregnant and stressed! NEED TO VENT!!(kinda long sorry)

So me and my boyfriend have been together 6 years and we've definitely had our ups and downs. He has a drug history you name it hes done it unfortunately 😥 but ive stuck by his side and did not give up on him till he got sober, which would be for so long and then start up again. 3 years ago almost i gave him an ultimatum to either go to rehab or he has to leave welp he didnt choose rehab. So while all this was happening i started talking to this guy i worked with i know very stupid of me! But he was giving me the attention my boyfriend should of been giving me, but he was emotionless from the drugs.. so after i left him threw him out hes crying begging for me back almost every night swears he will change! I did not even let him see his child cause he wasnt stable enough! So 3 months go by and i decide to give him another chance(i keep saying its the last one!) That was December! I told him he needs to get help welp he didnt till the following January! He went to rehab for 28 days and seriously came out a new man! I was so happy it was incredible everyone in his family was so proud of him cause he was doing what he had to do in the recovery process and was actually enjoying being sober for the first time in a long time. He was sober for 4 months.... then he started drinking again and hasn't stopped so 4 months straight drinking everyday now he says its okay cause alcohol is legal, hes not sticking a needle in his arm anymore that i shouldnt bitch about his drinking. But heres the thing he doesnt know how to only have a couple he has to get belligerent drunk! And i feel like hes trying to get that fucked up feeling like when he was doing drugs. And he says if i wasnt pregnant i would be drinking too, like no sorry not like an alcoholic! He makes up excuses to go to the bar down the st from the house. He was on a 2 day binger for the 4th of july! And now hes talking about a hall pass since i messed up in the past then he should too!! Mind you he said this when he was drinking... i just dont know what to do anymore im so depressed, stressed, when i should be nothing but happy that im pregnant FINALLY but no im dealing with all this aggravation and sometimes i wish i could just disappear for awhile... if you made it here thanks for reading i need to vent on here since i don't want everyone on social media knowing my business.