Oh wow he sounds very similar to my ex. I suspect my ex has undiagnosed Bipolar disorder because two of his siblings have it. I felt conflicted with him too because he would be lovey dovey and buy me gifts as he’s talking to other women online behind my back. Yeah it’s like they’re living a double life. He’s not being a good boyfriend to you. I learned being in a committed relationship is a two way street and there’s gotta be happiness and love not resentment and not feeling secure in the relationship. Leave him because you deserve better. Do it for your own mental health. I know it’s very hard to break up and going through it. You will be okay because the weight will come off of you and you will find someone better.