What was the reason?

Anonymous
I started dating this guy at my job ( I know bad idea) and long story short we dated for a little over a year. To keep things short we ended up breaking up because I found out he had a couple kids on me (never told me, obviously) and he had sex with 2 of my friends. I found all this out by going through his phone, yeah ik bad idea, but my question is I don’t understand what was the point of even continuing a relationship with me. He was also in a relationship with one of the girls he had a kid with so I dont understand why keep entertaining me. We had our regular arguments like most couples but he always reassured me of how much he was in love with me and how he only wants me and anytime I mentioned leaving or taking a break he wasn’t for it, said we should work things out instead of leaving. I know y’all gone say “he wanted sex” but I offered to keep things casual, we was arguing a lot so I suggested just being friends and hooking up occasionally so we could move on and he wouldn’t do that. Said he wanted a relationship or nothing at all so I’m just honestly so confused as to why lead me on? Why not just let me go.
What was the reason?
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