How do I stop myself from texting him?

Self-control. If you need to delete his number, do it. If it gets to the point where you need to block the number, do it. If you truly feel that you need to stop talking to this person, take the steps that are needed to eliminate the temptations.

Remind yourself about why you should text not every time you want to. keep distracted and try out things that make you feel better or cheer you up!

From personal experience I found one of the only way to do so was to delete his number from my phone.

Watch tv, listen to music, take a bath. Distract yourself from him. Block his number or just ignore him. Don't look at his social media.

Don't make him further reasons to text you back. It may be the cause why you can't stop yourself from texting him.

Delete his number, ask someone you trust to help you and discourage you- if you want to stop talking to them for good, you can even block their number via calling the phone company rather than just by your device. That way you don't need to keep their number on your phone to keep it blocked. If you're asking this question you know you shouldn't be, so try and remember that when you think about doing it.

remember what the reason is that you feel like you shouldn't and just focus on that reason, put your phone down and do something to take your mind off of him

Channel the energy for other things in life. Sharing your feelings with friends and family can help you get through this period. Consider joining a support group where you can talk to others in similar situations. Thinking too much about texting him or wanting to text him will raise your stress levels, reduce your concentration, and get in the way of your work, relationships, and overall health. Don't be afraid to get outside help if you need it.

Delete his phone number, delete him from social media. If you still have him in these aspects of your life you will feel the need to check up and talk to him. Instead of talking to him, put your phone down and do something solely for YOU! Go for a run, draw a picture, take a long hot bath. It will help you forget and it will make you feel great :) .

busy yourself with hobbies or going out with friends and just concentrating on yourself. sooner or later you will be surprised that you will wake up one day and he isnt the first person on your mind.