Relationship problems always

Well, I have a major problem within my relationship now it’s been confirmed. My sons father has been sneaking behind my back again. Last time I gave him the benefit of the doubt since he changed his number and did a lot of hard work to change his actions. However, he’s back to the same shit once again. He has been acting off, and now I know why. We have a 7 week old so last night and days before he begged me to do anal so I did. When we got in the bedroom he then told me he didn’t feel good. Coming from a dude who has went our entire relationship begging me for anal. Well his dick wouldn’t stay hard or anything. I’m pretty sure this guy is actually cheating on me. He’s the guy who can only get off once per day then blamed it on stomach pain, when I know he felt fine because he didn’t throw up or run to the bathroom. Well anyways back to my story, he decided to hit up some people he swore he was done with and has been texting the girl he said he was done with for a while now. However, he’s not done. He has been contacting these people on his new number because before I demanded a new number and now he’s actually up to the same shit again. He deletes texts and blocks them when he comes home. Well this girl had sent him 2 pictures while he had her blocked. I can’t see what the pictures are, I just know she sent them to his phone. The phone number she wasn’t supposed to be having. Actions speak louder then words do, this guy is living a double life trying to get me to believe one thing but in fact he’s doing the opposite of what he said. To my knowledge he’s kept his word for a couple months if that. However, I don’t deserve to live my life with someone bsing me. He wants the best of me and the best of everyone else but that just can’t happen and isn’t an option for me bc these people bring stress, drama and drugs to our relationship and I refuse to let that take over me and my son. With all this said, I 100% completely give up and I’m going to start moving on with my life.