I've dated a few men like this in my time and wonder why I attract them. They come on strong at the start, plenty of texts, calls, very attentive and demanding of your time. You can get swept along with things and start putting more time into things that you would like to ideally. Sometimes they complain that they don't see enough of you, they shower you with affection, kisses everyday on texts, hand holding and are often very romantic. Usually they tell you that they love you very early on. However the more you give them in return and when you give them what they want (more time, affection whatever it might be) the less happy they seem to be with you. Then almost overnight they change their minds and usually give a wishy washy excuse for example 'they thought they were in love but they don't know now' things 'don't feel right'. Suddenly something which wasn't a problem before is e.g age gap, your job etc.
I don't have a problem with them falling out of love but why do these types rush in? is it because they are needy and want it to work?
I find that I've been hurt and had my time wasted by this type of man several times.