OP, I've been in two relationships with men exactly like this, the first for going on 12 years and the other I ended a few weeks ago after almost a year.
Both were so attentive and helpful, I honestly couldn't believe my luck. They did more than their fair share of housework and would pass me a towel to get out the bath, help me dye my hair, literally drop anything for me (which I wasnt actually a fan of because I'm incredibly independent, but still).
The first was often out til early hours, wouldn't answer phone etc, had some interesting reasons for being hone hours late from work etc and I found womens phone numbers in his wallet on more than one occasion.
The second did a right number in me as I genuinely believed I'd struck gold after my nob head ex. He appeared to pretty much worship me and every single kind if my friends said how lovely he was and how happy I seemed.
I noticed fairly early on however that he was insecure and passive aggressive, often making little 'jokes' about how I was probably going out to see my boyfriend etc. I ignored my gut, and he proposed last year.
Within a month it transpired that he was still online dating, though I stupidly fell fif his excuse that he hadn't realised you need to deactivate your account. One night, really late, he got a phone call whilst lying in bed next to me, but didn't answer it. I knew in my gut something was off so confronted him. Long story short it was his 'psycho' ex who deeply traumatised him with her 'mental' behaviour, but to cover for that gave me the name of another random woman.
I found random woman on his facebook and messaged her. Turns out they'd been on a date just before he proposed to me, and that's only one I know of, there'll be more.
He begged and pleaded to stay, in fact still is, but all trust was gone and frankly I cant stand the weak, pathetic idiot that he is. From what I can gather, hes told friends and family I was thhe problem and wasnt prepared to work on the relationship, which I shan't lose sleep over but still.
Get rid of him OP, men like this will send you bonkers, then you'll be the 'psycho ex'.