The sooner you express yourself, the better off you both are, regardless of valentine's day. Don't drag on the relationship because you feel guilty, you need to put yourself first. Do be kind if this is someone who has treated you well and that you care about.
Like she said,used,and mislead too, should of done it pretense bro. But if your not fulfilled in the relationship, talk it through, and if there's really nothing to be salvaged, well don't drag it out, and don't ask for the present back either lol