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I'm sorry you're going through this! Your feelings are valid for sure. This is a tough situation to be in

The first thing to do is be mindful of your feelings. Don't judge yourself for any thoughts or feelings you have towards the situation. Notice them but let them pass.

Also remind yourself that there's a difference between friendship love and romantic love. Just because he does not love you romantically does not mean he doesn't love you as a friend, and that you aren't treating him well. The interactions you have with him are just different than what he'll have with his boyfriend because it's a different type of relationship entirely. Also remind yourself that you're not stupid. It's not that you're a bad person or unworthy, it's just that he isn't attracted to women and that's not something he can help.

Set boundaries. If you have him added on social media you can unfollow his posts so you're still friends with him but don't see what he shares. That way, if there are any pictures or statuses about his boyfriend you don't have to see them. It's also very valid if you want to take some space from him or limit contact for a little while, but if you do this it may take some explaining that it's not his fault.

It also takes time to move past feelings like this. Just because you have strong feelings now doesn't mean that you'll feel like this forever. It's very fair to give yourself time to feel what you are feeling and find ways to cope with it, but that doesn't mean you won't find someone in the future.

There are apps for dating and even friendship, and there are also clubs and social groups that might be in your city or surrounding towns. It's worth looking into these, both for friendships and potential intimate relationships. You'll at least meet people you have something in common with, which can really help.