It sounds like you're still hurting from your last serious relationship, well serious to you anyway. You're still mad at her for putting you second and you're kinda taking that anger out on other women. Hence why you've had so many meaningless relationships where you were seeing several women at the same time. Part of you probably sees all the women you've been with lately as her(have any of these women had either physical characteristics or personality traits that remind you of the one girl?) and by hurting them, you're getting back at her. Also the fact that you don't care about them until your alone and lonely just goes to show that this behavior is a result of being really hurt. Now I could be completely off, but that's what I saw by reading your post. My advice would be to not date women for awhile. Give yourself a chance to heal and put your head back on straight.

Well what I really think you need some time, indulge yourself in your work , sports, or something you like to do, it will distract you from her thoughts, wait till you get to your original thoughts and mind, and then I guess you can really move on from there.

mikedavike28 : A lot of relationships happen because people are afraid of being alone (this mostly goes for woman but also for men), they want to feel happy. Being happy is a temporary emotion it always wares off. That is why most people in relationships are arguing, cheating, etc...

You have come to realize that in life people do not make you happy. Only you can make yourself happy. Never rely on other people for happieness or you will get screwed badly. I've been down the same road and I just stopped caring. In this case, you relied on this girl to make you feel happy and special but she did the opposite and it destroyed your heart. That is why you have no emotion for relationships anymore and why you do not care anymore. Its better to learn the lesson then repeat it like other people do to the point where they are brainless robots who think they have a chance at happieness.

The less things you need in life the happier you will become. If you constantly need to be around people, or need relationships, or need material objects, or need to party or need to get drunk etc... well then you will never be happy until you get your temporary items in your hands then you will get bored and look for more.

Dating multiple people is like filling out multiple applications for jobs, it doesn't really matter who you get with just as long as your with someone. This is probably why most people never succeed with dating. The employer or dater want too much out of life and cannot settle for what is in front of them while the person on the other side might accept what is in front of them but get a cold shoulder and ignored. Even if you get hired or get in a relationship you will see their true colors down the road and is that really something to be happy about or look forward too? Not only do I feel this way about relationships but also working at a job, there is nothing appealing about either.