Love takes several different forms in the text: lasting love that’s still flawed, love that casts a glow on everyone else, love that doesn’t last, friendly love, familial love, admiring love, love as an intellectual topic, etc., but the main point is that love is not the sort of all-consuming force you see in Anna Karenina. Love in To the Lighthouse is pretty tame and usually turns out to be love for Mrs. Ramsay.
Mrs. Ramsay does not love Mr. Ramsay. Lily loves Mrs. Ramsay despite spurning almost everything Mrs. Ramsay stands for.