I’m having issues with girls losing interest.

For reference I’m 18, and 5’9 in good shape and into fashion. I like to think i dress well and am decently attractive.

First girl, met through some mutual friends and already kinda knew her from school. She was really into me. Set up a date a week in advance when I met her at a party. Day before that, saw her at another party and made out with her a bit. Hung out the next day at her house and made out more in her bed (had to leave her house early). Then she left on a week long trip and has been cold for quite a while, busy, etc. Texted her 2 weeks ago apologizing for being cold (i was coming on way too emotionless, only texting for logistics. Didnt work too well cause she was shy) and saying i wanted to hang out before we both left (leaving this city for diff colleges). She responded “sorry for taking so long to reply, im at a cabin but we should hangout soon”. Asked how long she was gone, no response. Moved onto other girls for a few weeks. Texted her earlier today when the other stuff didnt pan out but no response. Probably lost cause on this one.

Another instance, got introduced to this Russian girl with some friends. Could tell she was into me. Push/pulled, acted pretty indifferent, and flirted verbally pretty well. Good eye contact. She was putting herself in my physical space, etc. She asked me for my Instagram when she was leaving, and I said nah (I don’t have Instagram). I gave her my number instead. She said she’d send me a text but never did.

The other day, went to a cafe/restaurant with a friend. Started talking up this cute cashier/server (20-22 years old probably). Light flirting, good rapport, solid eye contact. Caught her sneaking glances of me through the window. She’d only talk to me and not my friend. She made a comment about my camera, and said she had one too but didn’t know how to use it. When I was leaving I said thanks and said “You know if you ever need help with your camera....” and she said “Yeah! Whats your instagram?”. I said i didnt have it, and she gave me a piece of paper to write my number down. Said thanks and she asked me for my name and we shook hands, then I left. She never texted me.

My self confidence has been pretty high recently, and I’ve definitely gotten better at talking to strangers. The only one that kinda bothers me is the girl I knew from school, but I’m not gonna overpursue/pursue any further if she doesn’t respond.

Any advice for me fixing this issue of girls losing interest?