Hmmm. Lot of factors here.
I’d kind of be interested more in how he’s been “since you got to know him”?
I mean if he’s clearly quite “mainstream” now, with a regular life and no drama and good social skills and a set of “normal” mainstream friends (you’ve actually met them - not just he’s told you about them) then past stuff might not make a big difference.
Is his lifestyle quite ok now - does he work/manage his finances well/have a plan for the future/normal hobbies that he likes?
Do you generally have good judgement when it comes to interactions/people? Have you rushed into things before?
Are you looking to move on together/have children/do you already have children?
Have you got any red flags about how he behaves towards you?
I have a couple of (ex) friends who were on the fetish scene/bisexual etc.
I dropped them both after a while NOT because of their sexuality but as they seemed too overdramatic/weird and I think the “sex positive sex obsessive lifestyle they seemed to lead just seemed to be going nowhere and contributing to them not being very normal/well rounded people?
It was like they were still stuck in their 20’s and casually dating/sleeping around and it was becoming compulsive behaviour, not “enjoying expressing themselves sexually”
I mean I’m quite liberal and don’t want the marriage/three kids/mortgaged house in the suburbs, and they were fun people at times, but I think they were gradually just detaching more and more from mainstream life and it was increasingly weird to communicate with them because of the sex obsession
what consenting adults like to do is fine, but every conversation being about “finding the next club to be tied up in whilst wearing suspenders” gets tedious and boring after a while.
My worry would be that he’s told you because he’s now expecting you to “reward his honesty” by engaging in his kink permanently.
Similarly with the MH issues - there seems to be an element of “Ive said I’ve got X, so that excuses any weird behaviour now”
Read some of the “AUtogynaphile widow” threads on here
these men have a particular fetish, and the wives feel that “give a fetishist an inch, and they’ll take a mile” where the fetish basically has overwhelmed everything “normal” in the relationship