I met a guy online and we dated for 3-4 months. We met once a week, took two months or so for the first kiss... nothing serious.
I never invited him to my house, but accepted him dropping me off at the door, so he knows where I live.
I left him when he showed up at my place of work with flowers "because it was 1 month from our first kiss"
We were meeting at a cafe nearby and I had asked him to let me know when he arrived (he was late), so I could make time at the office while waiting for him,
For me, this was an ambush, he could have given me the flowers at the cafe, but he decided to make a scene from a romcom. The receptionist was laughing, everyone looking at us and giggling. I felt violated and being someone I had been dating for a couple of months I felt it was very inappropriate and territory marking. Of course, he was very offended that after such a lovely gesture I was put off rather than jumping him [rolling my eyes]
Fast forward a month, I had left him, no contact, everything normal. It is my birthday and I get a message from him saying he left something in my porch. I check my security camera and sure, it is him in my porch and blowing a kiss to my camera. He left a passive-aggressive letter, a keychain with my and my children initials
and a tshirt printed with a photo of my children 



I did not like that he even used their names when he had not even met them. After that I removed him as a facebook friend, blocked in whatsapp, etc Covid starts and he is stuck abroad, months go without contact until recently I receive a call from a number that I don't know and it is him telling me he is back in the country and wants to be friends, etc. I asked him if he knew that he was blocked from whatsapp, that I had removed him from facebook, etc and also explain that we don't have many things in common and he doesn't bring anything to my life, so I do not wish to invest in a friendship with him. The call ends with "well, you have my new number if you change your mind".
All good, but a week later or so, he sends me a message through instagram, a screenshot of my profile in a dating app, that says "you can meet her around Glasgow" (where he lives, I live in a different city). My bad, but I replied "no, you won't see me in Glasgow". A few days later I get another message telling me about the travel restrictions. I answer that I am not thinking of travelling in the middle of a pandemic and that just shows how he has no idea of who I am, and how we don't have many things to talk about, so he should stop messaging. He then tells me how he was going to leave flowers at my house this week, but he decided to call me first and because I did not answer, he turned around. That pissed me off. I live alone and sometimes with my children (split custody), and I am very very angry that he thinks showing up at people's houses like that is ok.
I don't think I can get police involved since I don't fear for my safety or threatened, it is more about boundaries and respect. At the same time, I don't want him to be anywhere near my house if my children are at home. I can't explain why, I just feel all my alarms going off and in mommy bear mode.
I am going to block him in instagram too, but before I do I want to send another message warning him about coming to my house.
"Wandering around my property uninvited is trespassing and I will not hesitate to contact authorities and providing with the video evidence from my security camera."
I do not know if I should talk about how I have blocked and ask not to contact and he keeps doing it and is it harrassment?