Here are links to 7 articles, from PC's archives, that may be of some help (the first by DocJohn.) Some of these deal with marital relationships & I know you're not married. But hopefully the concepts discussed can be applicable to your situation as well:

What is Commitment Phobia & Relationship Anxiety?

Are You Trapped & Unhappy in Your Relationship?

Loneliness within a Marriage

6 Ways to Regroup and Reconnect With Your Partner

Don't Give Up When He (Or She) Won't Open Up | Building Relationship Skills

https://blogs.psychcentral.com/love-...dium=popular17

https://blogs.psychcentral.com/love-...dium=popular17