Dreaming about love in general in the form of being in a relationship could have one or two main dream interpretations depending on how you are doing in life. For example, if you are happy in your current relationship, having a dream about you being in love and happy can simply be your mind's way of expressing its contentment with your situation. Alternatively, the other dream meaning could be that you are lonely, and wishing that you had someone to love you, or to be in a relationship with. This dream interpretation is relatively straight-forward if you look into your personal relationships a little bit to come to an understanding.
If your dream is a tad more specific and you dream that your friend or someone close to you is in love with you, it may be your dream compensating for a lack of returned feelings. Perhaps you love your friend but they do not love you back. This unrequited love could be the reason for the dream. This type of dream might also occur if you sense that your friend is in love with you, when you have no particular interest in them. If you think your friend is in love with you and it has been a subject that you have been heavily considering recently, then this could be your subconscious trying to work through everything. This is what a conventional dream dictionary would suggest.
On the other hand it may be something more abstract. Maybe you have taken in some intensely personal aspects of your friend's personality or views, and you have incorporated them into your own behavior. Dreaming that you are in love with them or that they are in love with you represents a close personal bond, which is what the dream may be trying to get at. Dreaming about love doesn't always have to be sexual or romantic, and can often just be a way of your mind and body dealing with strong emotions of all kinds. Love does not always have to be equated with lust and sexual attraction. It is a less romantic dream interpretation, but it is just as plausible.
If your dream gets more physical than that, and you dream that you are making love in a public place, then it could mean a variety of things. Contrary to how visceral the image that comes to mind is, the act of having sex in public in the dream world is not so blunt in terms of dream meanings. Having sex in a public area in the dream usually means that you are questioning your own sexuality in accordance with commonly accepted social norms and practices. Maybe you are reconsidering views on sex, marriage and relationships. The meaning of dream like this could be that you need to be more expressive of yourself, physically, emotionally, or mentally. Have you kept your opinions to yourself lately? This might be your dream telling you that it's time to let them out.