The tango is a very intimate dance. It’s clear you are comfortable with the intimacy involved in that. How do you feel about sexual intimacy? (You don’t have to really answer).
You say you fall in love with these women. Do you desire physical intimacy with them? What does seeing that love materialize look like to you? It sounds to me like you are anxious about physical intimacy.
You can have relationships with deep discussion and interesting activities. But intimate relationships need to be taken to that physical level. It sounds like you are not initiating that.