Intro: MRP lurker but total newb still.

Have read enough to have the pill lodged in my throat, trying to swallow, lacking discipline.

Married (31M/ 33F) and in a long term dead beadroom. Like, totally dry for multiple years. I know that a lot of it is my own faggotry, but my wife has also gone through some serious health stuff and has some past trauma that the comfort of our marriage has let resurface, or at least now she can feel comfortable saying no (which she has no problem doing). We are in fairly open communication about this being an issue, but no changes yet. We know she needs therapy, both psychological and hormonal, but aren't in a financial place to afford either ATM. Hoping new healthcare next year will help.

I'm working on myself, physically (weak but naturally fit and attractive) and mentally/frame-wise (weak but improving).

Question:

Was just propositioned by ex-work acquaintance outright for sex. She knows somewhat of my situation though her ex who was an ex-good-friend of mine, but also a pathological liar it turns out and currently serving a long term prison sentence. I let her know I was potentially interested and tried to not stiff arm her or lead her on excessively.

I have always had a moral code of not cheating and have succeeded so far in upholding it despite the dead bedroom while still gaming and flirting reasonably regularly. I have not, however been offered an unconditional "let's start with a blowjob on the roof of your apt building and see where that takes us". It feels awfully good to be desired sexually and is very tempting, even though I'm worried about my ability to preform well after such a hiatus.

I think that a she would be down for a strictly FWB and it would undoubtedly help me strengthen my frame and "not-give-a-fuck-edness" and I don't think she would try to blow my shit up but I am also not ready to nuke my marriage.

Advice please. Thanks in advance.