If your boyfriend does not text you back then the first thing to do is not jump to any conclusions. Try not to let any insecurities you have make you overreact and do give him the benefit of the doubt. Males are not renowned for their ability to keep in contact regularly and often it is nothing personal, it is just in their nature. Often men prefer to speak either via a phone call or face to face. If he hasn't replied to your texts for a couple of days, trying phoning him and see if he will pick up. Sometimes, with anyone, if you text them and they have their hands busy they may simply forget to text you back. Normally a phone call or a missed call implies that you wanted to speak to them directly and can signal a more pressing need for them to contact you back.
How long have you and your boyfriend been in a relationship for? If you are still in the early stages of your relationship then it could be that he is still adjusting from single life and hasn't quite got used to the idea of being in more regular contact with someone. If you and your boyfriend have been in a relationship long term then he could just feel as though you speak regularly enough. Either way you should be able to talk to him if his lack of contact is upsetting you. Try speaking to him face to face and explain that you would like it if he could be more reliable with his contact. Give your boyfriend time to express why he thinks he doesn't text you back and the two of you should be able to come to some sort of compromise. Rather than text numerous times a day you could limit it to one phone call a day or every two days.
How long have you and your boyfriend been in a relationship for? If you are still in the early stages of your relationship then it could be that he is still adjusting from single life and hasn't quite got used to the idea of being in more regular contact with someone. If you and your boyfriend have been in a relationship long term then he could just feel as though you speak regularly enough. Either way you should be able to talk to him if his lack of contact is upsetting you. Try speaking to him face to face and explain that you would like it if he could be more reliable with his contact. Give your boyfriend time to express why he thinks he doesn't text you back and the two of you should be able to come to some sort of compromise. Rather than text numerous times a day you could limit it to one phone call a day or every two days.