Well jumping into bed with him was not the best thing to do when you are interested in more then just a one night stand, but this isn't a certain death for the relationship either. The sad fact is some men do these things and there isn't much you can do other then live and learn.
If this is the case or not it is debatable. If he text ed you first then there is hope he may simply be busy. The key here is to not appear desperate or needy. Send him a text letting him know how you enjoyed his company and look forward to getting together again in the near future. This puts the ball in his court and lets him know that while you would like to get together again you are not sitting at home waiting.
DO NOT text him again after that, give him time. If you haven't heard from him in a week and you are still interested in getting together send him a text stating you are going to be in his town for a quick trip and ask him if he would like to get together for a coffee. Explain that you will be busy but would like to make some time to see him.
If you still do not hear from him or he doesn't sound interested then it is time to let it go. If he texts back and wants to get together do so. But when you get together make sure you appear like you are interested but do not under any circumstances act like all you could think of was him and this meeting. Talk about other things if he starts discussing your relationship play it by ear. If he appears to act as though he wants it to go somewhere then do so if you want.
Keeping him interested is easy. If he is interested he will be if not nothing is going to work. Relationships are not about games and tricks. They are about finding something in common and attraction. If you are both interested then it will work but if one is only looking for a little fun nothing you do is going to change him.
I wish you the best,
This is a bit confusing. I can understand why you are upset, but keep in mind he may not have known he was infected or he may have thought you were telling him you were infected and thus made him nervous. Sounds like a simple case of miscommunication.
I would wait to contact him until you have the results back from your testing. If in fact you do have something you need to call him and let him know. Try not to get angry as he may simply not have known which is very common. Calmly explain to him that you have this and recommend he gt tested. let him know that you do suspect it came from him as you have had no other partners.
The reason why I urge you to wait until after the test results are you do not want to make this so much worse then it is. If in fact it is a simple yeast infection or UTI then you are going to be a bit embarrassed by jumping to conclusions. If in fact it is nothing make sure you call him and let him know. Do not text him as this is more something that should be discussed between the two of you.
Let him know why you jumped to conclusions as you are not normally the type who rushes into bed with someone you have known a short amount of time. If he doesn't answer his phone (Remember you told him not to) Text him and ask him to either call you or answer the phone as you need to speak with him.
Let him know that you miss him and are interested in seeing where things are going and make sure you apologies if you have no STD. It sounds like he is still interested so keeping his interest isn't your problem. Your problem is getting past the main issue of miscommunication and getting on with the relationship.