Cheating or am i bugging?

My boyfriend now Ex just got an apartment not even two weeks ago! This is our first apartment & super excited! We have a 6mo old babygirl as well so it felt like we were actually a family! Well before we moved in together we were broken up, i stayed at his aunts house & he went back to his moms for almost a month. During that month i tried making this work but he wanted nothing to do with it until we got the apartment & we both Agreed the past stays in the past we’re not brining that old negative shit in our new happy space. Well, before we moved in i ask him to let’s be honest & if he did anything or talked to anyone while we were broken up & he swore up & down he didn’t talk to anyone or hang out wit any girl. 2week in our apartment being yesterday i asked him again which i shouldn’t have & he admitted he smoked a blunt with a girl he used to have sex with years ago & her friend. He was in the back seat nothing happen whatever. I also just found out he had an old Snapchat he told me he couldn’t get into but was on it the whole time we were broken up. I told him to never go on it again & delete it he promised. Yesterday i told him to let me sign into it and everything can be cleared. Well on this break we had he’s going on a hunting spree hitting up all these girls making sexual comments asking them if he can fuck them give them head.. we were broken up so even tho i was mad in his head we weren’t getting back together. I continue to look & he’s been on it the WHOLE YEAR!!! All while i was pregnant after i gave birth!! We just got this apartment that’s 900$ a month I’m in school with a 6mo old baby how tf am i gonna pay this alone? I kicked him out but should i keep this all in the past? And let him come back? While we were in the apartment he hasn’t been on that Snapchat. And things were actually going really good i felt the love like i had for him in the beginning of our relationship. I also have nowhere to go hence why i was living with his aunt.. which i was uncomfortable because that’s not my family. This apartment is also so beautiful & I’m so happy here.. ugh need advice.