There is no specific way to know if a person truly loves you but there are a few signals to let you figure out what is on the mind of your loved one.
Paying attention on how the person acts, what they say and what they do when you are together can let you know if the person you love loves you back.
1. Is the person happy being around you?
If a person has had a very bad day but lights up when you come around, that's a sign of love. If he/she is in love with you then the sight of you or your voice is guaranteed to make him or her feel better. To be sure, see how s/he reacts the next time you show up when s/he was in a bad mood.
2. Does the person say "I love you" and means it?
If your romantic partner really loves you and tells you this much while looking into your eyes, sounding earnest, and not wanting anything from you, then it's likely that s/he really means it.If the person undeniably loves you, then s/he will say it for no reason at all, not just because s/he needs a favor or because it feels like the right thing to say. However, remember that there is a big difference between "Love ya!" and "I love you."
3. Can the person honestly be him/herself around you?
When someone loves you, he completely opens up to you. If you get to see a whole side of that person that he/she doesn’t show the public, that may be a love sign. For instance, if your partner is pretty serious or polite in public, but shows a more goofy and silly side when you're alone, then s/he is really opening up to you and loves you. If the person shares his/her deepest emotions with you and is comfortable with it, then that is love. If the person is also being comfortable not looking perfect, tripping, or having food stuck in his or her teeth around you, that means s/he is okay if you see every side of him or her.
4. How does the person look at you?
There is that stir that someone gives you that melts your soul. You can check your loved one's face the next time you see him/her… does he/she look at you in a goofy, watery, silly and adorable way that can only be described as "googly-eyed"? You will know it when you see it. You won't get this look all the time — you can spot it in the morning, or randomly across the dinner table. You may also be able to catch the person staring at you with the same expression.
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5. Does the person talk about your future together?
If the person talks about the future and always includes you in it, then there is a good chance s/he truly loves you because true commitment means seeing a forever with another person. If the person routinely talks about what you're going to do in the future, about what your lives will look like one, two, or even ten years in the future together, what your kids will look like, where you will retire together, or where you will go for your honeymoon, then he is probably in love with you.