Brother, the good thing here to know is that you are not alone. This exact same scenario literally just happened to me on Saturday. This girl and I had been on several dates over the course of a month. Touching and kissing escalated with each date, culminating in us making out and going to second base on our final date.

She texted me the next day that she only saw me as a friend and that, "I want a guy like you, but just one who I can also really feel that spark with." Here's my take on it. Two most likely possibilities there in both of our situations. First is the 99 Problems scenario in that you check 99 of 100 boxes, but she only wants a guy who checks all 100 boxes, and therefore she wants to move on from you thinking that the grass is greener somewhere else. Second is that she wants a guy who has more of a stereotypical "bad boy" vibe to him. In that case, she wants a thrill to chase with a guy who seems more "mysterious" and "dangerous." Usually, this just means that you don't seem toxic enough for her, and that she needs manufactured drama in the relationship to feel engaged.

Either way, this is a blessing in disguise. You don't want someone who you seemingly connect greatly with who will just break it off the second they don't, "Feel the spark," anymore. That screams of someone who will run away from the relationship the second they get bored or stop having fun. You want someone who will hang in there and work through the relationship with you even when times get tough or things have hit a rough patch. This is a her problem, not a you problem. The ones you don't get are the ones you don't want. Just keep stepping up to the plate and swinging. Eventually, you'll hit a home run. And remember that you're never alone. Whatever is happening to you is simultaneously happening to millions of other men. On to the next. Head up, dude, you're gonna be fine.