>>33914998 (OP)
I think the only truly unconditional love is the love of parents for their children.
I do love my husband a lot. I loved him just as much when I gained nothing from loving him. He got badly injured and spent two years mostly bedridden, unable to work or to do truly anything fun with me - he could not walk, take me on a date, drive a car, have sex with me. I loved him more every single day of his illness. I loved him when he was thin, fat, muscular or weak. I loved him when he was fun to be around and when everyone else left him.
I'd die for him without a doubt. I love him with my whole heart, and he's the most important person in my life. I still get butterflies in my stomach when he smiles at me, after almost 10 years.
I also know that there are things he could do that would make me stop loving him - if he became cruel or if he cheated on me, I know I would not forgive him or be able to love him. My love is conditional on him being kind and loyal. I chose him because of that, and if that stopped being the case I know I'd love him less.