Sabotaging relationships

Everytime I like someone and they start showing affection back, I start immediately running. At first I thought it was because they weren’t right for me or I didn’t like them enough but then I realized it’s a pattern, I cling on emotionally unavailable people and avoid the ones who actually care about me. I’m so afraid of commitment and abandonment at the same time. but there’s this guy that I’ve had a crush on for a while and it was not serious at first but then it became mutual, and I know deep down I actually care about him and that he’s different, but I feel myself falling into my habits of running away and sabotaging the relationship, what do I do?