Do you find it hard to be friends with someone if they dont return your visits...?

If you are sure they have done things to show that they don't value your friendship for more than three times, then, you can consider stop being friends even you have only a few. You see, you deserve good friends and it is better to be alone than having bad friendship that left you with mental abuse. This will go on and on and never end and soon you'll be exhausted and crazy because it seems like you're the only one pleasing them. So, stop and enjoy your life. A quality life is more important than having more 'mental abusive' friends.