2 girls, 2 similar situations

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1)

first date goes fine, second date we kiss. She asks for a third date, she asks where to meet and I tell her her place (we live in two different cities, 1 hour trainride). Immediately when I first see her the third date, she acts a bit colder than usual. I'm not sure what's up. We're walking in the city, halfway the date I kiss her, and we end up at her place. There we start to kiss some more, I want to remove her bra, she says no. I tell her I have to leave. I don't hear from her for a week, so I send a message. She replies that she felt that it didn't 'click' between us and she doesn't want to see anymore.

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2)

Meet this girl at party. We go out for drinks and we kiss. On a second date very short date we kiss again. Third date I invite her at my place, we make out heavily, she's enjoying it, but after having taken off her sweater and bra, she doesn't want to remove her pants. I'm ok, and tell her I have to go to class. All the while she messages me, invites me to go out with friends etc... Because of busy schedules, I can't make it, all that worked out was a short date, we hung out in the city. She acted less interested. I felt I was losing her so I had to make up for something (mistake). During the date she acted less and less interested. We still kiss though.

It's her birthday soon, and she invited me for drinks with some of her friends. I really can't make it that day, though I invite her to celebrate at my place later, and I suggested to make her dinner. She responded me that she "doesn't have time that day", "maybe later this week".

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Am I trying too hard? Why do they act less interested? I've been on 4 dates with this girl, still haven't fucked. Should I move on?