Yes, you can replace "through" with "over". There is almost no difference. "Through" implies that you received love somewhat consistently during "the years". "Over" just refers to any and all love you received during "the years". You could also replace it with "throughout", which has the same meaning as "over" in this context. Also, "the years" implies you have been receiving love for a great many years. If you are referring to only a few years (less than 9 or so), I would recommend replacing "the years" with: 1 year : "this past year" 2 years: "these past couple years" 3-5 years: "these past few years" 6-8 years: "these past several years" any number of years: "these past X (insert specific number) years".