How to stop being insecure in a relationship – top tips

Hello.
Yes article has been very helpful to me.
But I would like you to give me an opinion about my situation or give me some advice.

A year and 6 months ago I met a person, who is the one I currently live with, he is 36 years old, I am 21 years old, we got to know each other to the point of forming a relationship, I also learned that he was leaving a home of 13 years, That relationship did not continue, due to the jealousy and possessiveness of that person and above all because she could not give him children, since she is a person super older than him, and is already disconnected.
In search of having a family and a different person who trusts him, we met. In the course of our relationship, I call it infidelity, he tells me that he was just closing cycles so to speak, why being with me it would dawn where his ex was. And even when I moved in with him, it was much worse, he cried out of nowhere, he felt sad, he told me that he loved me, but he had to resolve something, anyway, on his birthday we celebrated it with his cousins, I had the menstruation and that’s why I asked him to take me home at almost 12am, I thought he would stay with me because of being new in a home and the fear of waking up alone in a house, the hours passed and he didn’t arrive until 6am, there was woke up with her. He hurt my soul so much, I lasted almost 3 days without eating very badly, until I decided to return to my mother, and I returned to his ex-wife, why did I have to solve something.
In those months that passed, I met another person but I couldn’t get him out of my head, while I found a way to forget him by drinking and just like that, he had already left his ex, and had returned to the house where we lived, and he started looking for me even knowing that I was with someone else, he started sending me flowers. I work and things like that.
He told me that he would not stop insisting because he already felt safe being with me, without ghosts from the past to drown him.
Anyway, after several months, I decided to try it, of course I felt a lot of mistrust and it was not easy at all to remember all those ugly moments. However, he has managed to earn the fact that I trust him. But I always have that fear, that insecurity and now in these two months I have become possessive, something I don’t want, I don’t know, if I feel insecure about myself, I’m afraid to go out and do my errands alone, I always look for company and I want to learn to be independent.
I think I need help, I don’t want to affect the good atmosphere of my home.
What can you say to me?

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