If your husband has told you he's in love with another woman and spoken gently about loving your company but not feeling romantic towards you, it sounds like he genuinely respects you and cares for you. Many women are treated badly during a marriage breakdown. I believe you both deserve credit for having a respectful relationship. Obviously, there's a great history of caring between you both.
What can you do to make your husband feel romantic towards you, and fall back in love with you? I think that's a question you can answer much better than I can. You should remember the best times you had together. What made those times special? How were you both different to today? Can you recreate or revisit the way you used to be?
I suggest you talk with your husband, remind him of how wonderful things were between the two of you, and ask him if there's any chance you might be able to regain the spark. You loved each other enough to marry. You were passionate about each other. Tell him you don't want to just walk away from years of a beautiful relationship without making whatever effort is required to revive your love affair. Ask him if he'll please try with you.
You might be pleasantly surprised. Perhaps your husband misses the intimacy and romance you once shared and the other woman simply fills a role that's slipped from your lives. If the other woman has not yet won his heart, a passionate kiss might put you both back on track.
But you have to accept his heart might have moved on, sadly.
If he's genuinely fallen in love with her (instead of just falling into her arms or her bed), you're entering a new stage in your life. I hope you manage to protect the respectful relationship you appear to have if he becomes your ex. And I trust there will be another man who falls in love with you in the future, once you've had time to heal your broken heart.
But for now, I think it is worth having a real heart-to-heart with your husband about reigniting the intimacy and loving, if you're both willing to go there again and see if you can make it work.