I am sorry that you feel this way about your friends. Sometimes people get caught up in their own lives and don't notice that they are not caring for the people around them. Have you tried sending them an email explaining how you are feeling? At least you will know for sure if they are good friends or if maybe you should look for people as caring as you are? Also don't let this stop you from being the good person you sound like you are there are other good people in the world and eventually your good nature will attract them to you.

The money is a tricky one. My Dad always taught me that if you lend someone money then it should be with the understanding that you are happy to lose it and not something you rely on getting back. That way you think that at the time that person requests that and you can decide based on that thought. People are irresponsible with money so maybe stick to the old 'never a lender or a borrower be' and you can use the excuse that it has wrecked friendships in the past?

I hope that things work out with your friends and this is just a blip x