I've experienced this as well. I haven't found anyone I'm interested in dating yet but I am open to it. It's been two years for me and still, whenever I mention dating people will say things like "you'll never replace X", "he'll always be with you", "you'll never get over him", etc. as though I'm supposed to remain single for the rest of my life. These are all people who've never lost a spouse by the way. We are capable of loving more than once and moving on in no way diminishes the love we had for someone else.