How would you describe/show unconditional love for your partner?

I'm in a relationship with my boyfriend for 5 years now. He says he loves me unconditionally, but I don't love him the same and I don't know how to love.

there's a few things he does that upset me and he says I shouldn't try to change who he is, I should love him for him being himself. that sounds one sided to me considering that he tells me the things about me that annoys him.

I've been researching this and understand the 5 love languages, that not everyone loves the same. I've looked up how unconditional love has no limitations, is forgiving and puts love above all things. but something just doesn't seem right

how do you describe unconditional love and how would you show it?
How would you describe/show unconditional love for your partner?
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