Should I stay or should I go?

I’ve been with the guy I’m with since July 2nd, 2017. Last month this girl I knew from when I was younger was in need of help. She was pregnant, on parole and had no where to go. She knew once she had her son CPS would be involved from the first incident she had.. (fast fwd) her sons father was like a cousin to my boyfriend and I so we were helping him out also, he started getting drunk so I kicked him out. My friend invited me to Florida we left the night of the 31st and arrived home early morning on the 5th.. I came home and things were just awkward with me and him. All we did was argue for 6 days straight BADDD. (During this time CPS came and me and my boyfriend signed guardianship of my “friends” son) I started to realize he was spending way more time with her and acted like I wasn’t even home. Me and her got into an altercation so she had took me off for guardianship of her son and left my boyfriend on there. I felt so uncomfortable in my own home I finally kicked her out.. And what do you know? He left with her. (He says bc he signed the paper for guardianship) long story a little shorter.. He called me about a week later begging for me back. We talked and he told me some stuff I told him to tell me everything before I even considered taking him back bc I knew the girl was gonna contact me... Well as soon as I got home I received sex videos/pictures. (And some of the things he said were lies) And it totally crushed my heart. I just need advice. My heart is so broken, I’m trying to make things work with him bc I do love him but idk if the damage can be fixed. I wish he would just be honest with me, he says they didn’t have intercourse while I was in Florida and “it was never his intentions” but she texted me saying they did. She also said they did it in my kitchen while I was in my room on my phone. I live in an apartment so everything is on one floor my room is in the back and the kitchen is in the front. Idk what to believe anymore. 😭😭