Well, ENTPs tend to love like fire, immediate and passionate and reckless and all-consuming. When they think they are in love, they do everything they feel they should when they are in love; very passionate, and pretty showy. But it's too self-centered to me (which isn't a bad thing; love, if it isn't centered at least partly on the self, can be quite destructive). An ENTP that thinks he is in love will not be convinced otherwise, and they fall in love because they think they should be -- in other words, they have a certain list of characteristics they like, and when they find them they fall in love. It's more a perception of what love should be and with someone they think it should be with, and less actually wanting to be with the other person and caring for the other person.
Of course, this goes more with younger ENTPs -- it's not always so centered around perceptions, but it usually is very stubborn and fast-burning in any case. Whether or not you admit it, you ENTPs can be a larger-than-life and rather dramatic lot.
My love styles is more like coals. It takes me a long time to fall in love, and when I fall in love it's because I care for the other person and I feel the other person cares and could understand me. It's not burning passionate, it's not love-conquers-all or I-can't-live-without-you...not right away. It takes a long time, and it requires careful attention and patience and deep feeling. It's half about taking the time to understand, and it's about communication. It's about the sake of the other over that of the self -- what does the other person like? Why? Who are they and how do they think, and how could I make them happy until the end of time, even when romance dies? Like coals, it burns slowly but for a very long time, and if it's stoked right it could be worked into a bright flame, but it takes time for that to happen, and if the flame goes down the coals still burn.
It's not that an ENTP can't understand that or do it. It's just that a younger ENTP doesn't really understand it yet. I haven't met one yet that has, but then, I'm young myself.