I think for him to change the locks on you speaks volumes on how lost your husband is in himself and where his mind is not willing to make healthy decisions. For the moment... this is who he is and no matter how you may resolve this, he will not be the same as much as you may wish him to be. Accepting this is always hard, but is the first critical step for looking at the pain that encircles you and changing how you see it.
Love is a powerful tool, but the only one we can truly count on to wield it masterfully is ourselves and too often we forget that it is best used on ourselves... especially when we have entrusted others with it. Sadly, they become complacent in it's care, it gets a little bent or rusty, and then it doesn't quite hold up for the job when neglect has happened and it is handed back to us for self-application. You trusted him to keep it well-maintained and are now disappointed and hurt in addition to holding the tool that you're not quite sure how to use for yourself at the moment.
No better time like the present to relearn it's mastery.
My first thought about the locks would be to notify local law enforcement, then hire a locksmith to let me back in to my home, and with an LEO presence, regain access to all I am entitled to.
His actions are a legal cornucopia of everything in your favor... let the lawyers do what most of them do best, protect your rights.
In the meantime, admit the truth to everyone... he broke your heart (for the moment), but not your spirit and find your authentic power (hint: it's not in him). He took advantage of you, he broke his vows, he intentionally has tried to hurt you... this is not love on his part.
Your love is not misplaced, but right now, it is misapplied. Giving effort to something that will not benefit is a wonderful practice as long as what you are giving it to does not hurt you... this does, so time to dial it back a little. Of course you love him, or what used to be him, can you love what he has become?
I would think not... but the man he was and you respected, keep that idea of love in your pocket for the times you want to think of how kind you can be for someone who returns your respect, your passion, your patience, and your love, realizing that for love to grow, it must be returned in-kind.
That's the love you want for yourself.
Sadly, he may not be able to provide that for you again. This is where acceptance kicks it in the pants...
To focus on thinking straight for your best interest, place yourself in a position of non-judgemental strength... what is happening in your life is not good or bad, fair or unfair. It just is. What acceptance helps us do is learn to deal with life-changing obstacles like abandonment, betrayal, or loss. This may seem silly to many, but it is far from passive, it's a training ground for clarity and action as you begin collecting all the things due you as you proceed through what may be the inevitability... divorce.
But if you do not divorce, it also gives you the foundation for seeing that he is staying with you for all the right reasons... and they must be the right reasons because if they aren't, letting go is required.
Hope for the best, prepare for the worst... loving yourself more every step.