I think he might have misapplied the tenets of his religion. while religions differ in their acceptance of sex outside marriage, they are usually similar in some common, broad ethical teachings. There is probably something about treating others the way you want to be treated. From that, he should have deduced that he needs to respond to your texts, especially if he had been in the habit of responding to your texts promptly earlier.

It is also weird about the possibility of his losing respect for you. It would be weird even for a completely innocent bystander to base their respect of you on your sexual activity. If you have not robbed a bank lately and you haven't been watching TV on the coach for days instead of working on an important project you were trusted with, you should be OK in terms of being worthy of respect. But to first induce a person to have sex with you AND then lose the respect for that particular person precisely because she agreed is completely twisted; it is like luring an animal with a piece of food in order to torture it later.