If your husband is in Heaven, he will
have become what is called a saint.
We are taught that saints intercede with God for people who are still on Earth. You can trust, therefore, that your husband is praying to God for the welfare of yourself and of the children brought to life by the both of you. He has certainly not forgotten his wife and his children.
We are taught that all of Heaven rejoices when a single sinner repents. This means not only that saints know what is happening on Earth, they are also cheering like spectators at a sporting match for the team of people still alive on Earth to win against the rival team of the devil and his angels. Not only is he praying for you and your children, he is joyful when you please God and sad when you have a lapse.
As a frail and limited human, there will be times despite your love for your husband when thoughts of him will slip from your mind as you attend to other things, eg., when you are driving in busy traffic. Unlike you, your sainted husband will be vigorous, tireless and capable of near unlimited concentration and focus. Because of the Love that exists in heaven, Love being the imitation of how God chooses to behave towards himself and all components of his creation, youir husband, looking at what God is doing, will try to imitate God's own love for you. He won't be able to match it , of course, but, bound in his own love for God to try and love as God does, he will continue to love you and the children of the both of you fervently every moment of every day. He will, as a superior being, in fact, love you now more than you can love him in return. While that formal relationship between the two of you called a marriage is ended, the actual relationship of love without which the marriage is a sham, is continuing more strongly than ever before and, as a saint, he is supplying the greater part of it.
Truth is what is. You can't escape from what is and hope to be healthy in, at least, mind, if not also in body. So it needs to be acknowledged by you (which you are doing anyway) that, without his physical presence by your side, you are lonely. But, harder to feel even though just as true, is that he is, in imitation of Jesus as well as on his own initiative as a holy creature with free will, choosing to be spiritually with you --- and so you are not alone.
Perhaps when you remarry, he will make his spiritual presence recede from your new circumstances as the wife in a new marriage. Marriage (or remarriage), being a sacrament, is an announcement that the wife has entered a new spiritual union of two souls to which her sainted deceased husband cannot belong. Having followed the command to show special concern for the widow and orphan, which I suppose he has done by prayers of intercession, he is now free to let her go. And perhaps, like Rick watching Ilsa taking up a new life, he can say to his former guardian angel standing beside him: "Louis,