I'm a bit confused by what you mean by "out of the house", but I'm assuming that you mean you and your spouse separated. Whatever the case, try your best to spend as much of the day with her as you possibly can. Ignore all calls and texts, make the day all about her... even though it's also your birthday. Try to do something with her that you know she's wanted to do but for some reason you haven't, like a particular restaurant or attraction. Even though it's also your birthday, have a gift for her; and if she gives you one also be sure to open yours last. Women are far more emotionally involved with Valentine's than us men, but I know I would be impressed if my wife took such efforts to make amends.
Advice from a betrayed spouse
I'm a bit confused by what you mean by "out of the house", but I'm assuming that you mean you and your spouse separated. Whatever the case, try your best to spend as much of the day with her as you possibly can. Ignore all calls and texts, make the day all about her... even though it's also your birthday. Try to do something with her that you know she's wanted to do but for some reason you haven't, like a particular restaurant or attraction. Even though it's also your birthday, have a gift for her; and if she gives you one also be sure to open yours last. Women are far more emotionally involved with Valentine's than us men, but I know I would be impressed if my wife took such efforts to make amends.