Why do i feel so alone?

My exbf and i split about 3 months ago.He started in May leaving flowers and cards on my doorstep. The following week he saw me outside and left a big hanging basket on my outside table. Then on Memorial day i had a guy friend of mine help me with my pool.I then found on my front porch a card. He had the nerve to be on my porch when i had someone here. He said he hopes that i have found happiness and that will make him happy.That he is moving out of state in Feb. He is going there in sept to help someone with their house.(Thats funny i think that he just wants to tell me that he still has the same vacation in Sept as me and we were suppose to go away.Then he said that he wanted to know where i got a wall morale that we had put up and about how much it was. He said please get back to me you can e-mail me,call or text.He left all the information. He then signed the card your friend and i will always love you. I then checked my emails and he at the same time dropped the card off said Hi how are you?I left a card on your porch and please get back to me. I will always love you. What the heck is going on ? I am afraid that he is watching my house .