I try my best to treat all girls with the same amount of care, regardless of whether or not I'm "interested" in them. Of course, though, I do take more steps to learn more about the girls that I like and do my best to get more involved in their life; at the same time, I also invite them to be more involved with mine as well. I've never dated anyone, but I do know the thinking behind a good and healthy relationship. I'm speaking mostly to girls here, but guys, if you're reading this, learn from it, and become the healthy, godly man that you were meant to be. Do that and have patience, and you'll find the perfect girl for you.
If you're a girl looking for a guy that is healthy and good for you, I would look for a guy that:
1. Shows care to all girls, not just you
2. Shows care to his family
3. Doesn't "need" you
4. Has physical, emotional, and spiritual boundaries
5. Knows who he is and where he stands
In regard to number 1 and 2: You can basically judge how healthy a guy is by the way that he treats other people. If we have an interest in you, and we're not healthy, we will show you the best side of us, while unleashing our bad lifestyle whenever you're not with us. Girls, if your best friend comes to you and tells you she saw something unhealthy in your guy, don't believe her right away, but don't disbelieve her right away either. Look into it; there's a decent chance that she may be right. If a guy doesn't treat his friends or his parents or his brothers and sisters with respect, you can't count on him treating you with respect; once you enter into a relationship with him, you become just like them to him - a part of the broken, unhealthy family.
Oh, and an extremely important thing: DO NOT (I repeat) NOT, missionary date. Unhealthy relationships have much more power to pull you down than you do to pull him up. If he's not healthy, help him out, but don't date him.
In regard to number 3: There's one thing that I would warn any girl about; one sign of an unhealthy relationship is one where all the guy wants to do is spend time with you, and all you want to do is spend time with the guy. Fancy people call this "codependency", and it's extremely unhealthy. I've seen this happen and had it happen, and the relationship will fall apart, or at the very least be unhealthy in the end - every time, no exceptions. If you care about yourself, run from any guy who wants you to take part in a "highschool marriage" with him, where you are basically living like a married couple, spending all your time together, just without the physical benefits that come with marriage... *cough cough*
Anyway... yeah, run from a codependant guy. As my psychology professor says, "the longer a couple spends vertical, the more likely they are to end up horizontal." We guys are masters of convincing, and you girls are just the sweetest things. Have the courage to get out of a relationship if a guy is showing signs of codependancy. Because really, if you have the guts to say "no" to a bad relationship, you are so much more attractive to all of us healthy guys. I want a girl who would step out of an unhealthy relationship with me - it hold me accountable.
So, ultimately, here's what I would tell a girl who is wondering if a guy is interested in her:
Act like yourself.
We can tell when you're pretending to be someone you're not, and at least for me, that is a huge negative to any relationship. I want to see a girl for who she is, not for who I want her to be. Fancy people also call this "duplicity," where you are living one life, but have a "secret" life that you hide. This is also a killer, and I don't want it and won't have it in any girl that I would pursue. Act like yourself, and if our personalities don't mesh, so be it; there are more guys for you, there are more girls for me. It's not the end of the world if we break up from a relationship that we've never been in.
I want to date a healthy girl, while also being a healthy man for her. I want a girl who has an interest in me, but would choose not to date me if she saw something unhealthy for her in me. I want her to be independant of me, able to stand on her own two feet, while at the same time, I want to synthesize our lives together in order to produce something fantastic.
Be yourself.
And just maybe, we can be ourselves together.