Do you really and truly believe that you or any other human being can remain absolutely committed to another for the rest of their lives when they couldn't remain committed to themselves and I am not necessarily talking about infidelity.
Go to the mirror and fully scrutinize yourself. Do you see any extra pounds you may have put on because you couldn't remain committed enough to yourself to put down that extra piece of cake. Do you recall lying to yourself about quitting smoking. What about that exercise regime that you lied to yourself about.
The first and most important thing in life is to realize and recognize the fact that we are humans first and live within that knowledge and do the very best we can.
Each partner must come to know that we are all human and will therefore do humanely things. We must therefore respect some of the weaknesses of our partner.
