Should I sign my boyfriend's birthday card with "love"?

Ok, so me and my boyfriend have been going out for 4 months, and his birthday is coming up soon. Should I sign his card with "Love," or not? I'd don't want to write 'from, " because that sounds too platonic, but he hasn't told me exactly that he loves me yet, and I'm afraid that if I write "love," he won't feel the same way. This question sounds kinda dumb, but what should I do?